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Jeong, YunWon
f87cfe7e7a
* Guard all/any/tuple(genexpr) calls when the generator is a coroutine
`maybe_optimize_function_call()` reserves a `skip_optimization` label for
every `name(genexpr)` call and, for `all`, `any` and `tuple`, emits an
identity guard against the builtin plus an inlined loop. The port skipped
both whenever the generator expression's symbol table was a coroutine, so
`all(await x for x in xs)` and `all(x async for x in xs)` compiled to a
plain call.
An `await` or an `async for` in the generator does not disqualify the
shape: the inlined `FOR_ITER` raises the same `TypeError` that calling the
builtin on an async generator raises, which is what
test_builtin test_builtin_call_async_genexpr_no_crash asserts.
This was the last code-level difference against CPython across `Lib/`:
comparing every file's code tree by structure, opcode and constant value
(qualnames aside, which moved in 3.14.3+, and set constants compared by
value rather than by hash order) now matches on 1720 of 1720 comparable
files, up from 1719.
Assisted-by: Claude Code:claude-opus-5
* Name the ellipsis type `ellipsis`
`type(...).__name__`, its `__qualname__`, and `types.EllipsisType.__name__`
read `EllipsisType`.
Assisted-by: Claude Code:claude-opus-5
* Align compiler front end and instruction positions with CPython
Reject a bare generator expression in a class header and a format spec
nested more than two deep. Both parse here; the reference grammar has no
rule for either, since a class header only takes `arguments` and the
tokenizer runs out of nesting levels at the third format spec.
Scan the interpolations a format spec carries inside another format spec,
so `f"{x:{y:{z}}}"` reaches `z` when building the symbol table.
Give every generic function's type params scope a `.defaults` slot,
whether or not the signature has any default, so `co_varnames` and
`co_nlocals` match. Classes and type aliases keep theirs empty.
Decide an unparenthesized sole generator argument by the parser's
`parenthesized` flag instead of scanning the source for the shape of its
element. `_sum((d := x - c) * d for x in data)` opens with a parenthesized
group the rest of the expression continues, which the scan read as the
generator's own parentheses and left the call's out of its range.
Drop empty f-string fragments unconditionally. A concatenation whose
fragments are all empty now loads its empty string at the whole
concatenation instead of at whichever fragments happened to be plain
string literals.
Keep a byte order mark in source handed over as text, and report it as an
invalid non-printable character. Reading a file to freeze strips it, as
the encoded-bytes path already did.
Carry the filename into the errors `compile(..., PyCF_ONLY_AST)` raises;
they reported `<unknown>` or an empty name.
Across `Lib/`, the 1729 files that compile on both sides now agree on
opcodes, constants, flags, variable names, names, and exception tables,
and on instruction positions in all but 7 files, where a compound
statement whose body ends in a trailing `;` ends one column short.
Assisted-by: Claude Code:claude-opus-5
* Align ast module output with CPython
- Keep lone surrogates in string, f-string and t-string literal values by
reading such a literal from its source; the literal-value helpers move
out of `Compiler` into `rustpython_codegen` and `ConstantLiteral::Str`
holds `Wtf8Buf`.
- Give `{expr=}` interpolations their leading text as a Constant and
default their conversion to `repr`, in both f-strings and t-strings.
- Span folded consecutive literals from the first of them to the last.
- Take the `:` into a format spec's range only when the parser left it
out, instead of always widening by one.
- Report a node end that lands on a line start as that line, column 0.
- Give a generator expression written straight into a call's parentheses
the range of those parentheses, in the preprocess pass, replacing
codegen's source scan and `_ast`'s one-column adjustment.
- Drop the expectedFailure on test_ast_line_numbers_with_parentheses.
Assisted-by: Claude Code:claude-opus-5
* Align symbol table output with CPython
- Register an import as `DEF_IMPORT` alone, and an annotated parameter as
a plain parameter, so `import x; global x` is accepted and annotated
parameters are not reported as annotated names.
- Record a `global` declaration in the module block as well, and resolve a
name a `global` in an enclosing scope covers as an implicit global, so a
class body reading such a name emits `LOAD_NAME`.
- Resolve a name bound nowhere as an implicit global instead of leaving
its scope unknown.
- Require a binding only for a name an explicit `nonlocal` declared;
a free variable that reached the scope any other way already resolved.
- Name a generator expression's block `genexpr`; the code object keeps
`<genexpr>`.
- Locate a `def`/`class` block at its keyword rather than at the first
decorator. `decorated_definition_range()` moves from `Compiler` to
`rustpython_codegen` for that.
- Carry a comprehension symbol's flags over when inlining it into a parent
entry that only holds a free variable propagated from a child.
- Leave `__conditional_annotations__` out of an annotation block's
symbols and have the compiler cook up the free variable, which places
it after the ones the symbol table supplies.
- Check `from __future__` placement while building the symbol table, and
give `symtable.symtable()` the same docstring stripping and future
feature validation the compiler does.
- Floor `co_stacksize` at 1.
Assisted-by: Claude Code:claude-opus-5
* Locate the eval return and the interactive print like CPython
Leave `eval` mode's `RETURN_VALUE` without a location, so the exit block
is duplicated per reaching path and each copy carries the location of the
branch that jumps to it. `a and b` now ends with two returns as it does
in CPython, and `a if b else c` gives the first one the `a` it returns.
Emit an interactive `CALL_INTRINSIC_1(Print)` at the expression statement
rather than wherever the expression left the location, which differ for
`(a := 10)` and `f'{0:fz}'`.
Assisted-by: Claude Code:claude-opus-5
* Give interactive mode the conditional annotations cell
`compile_program_single()` emitted the `__conditional_annotations__` set
and its name accesses but never added the cell that holds it, so a module
compiled in `single` mode was missing the `MAKE_CELL` and the cellvar that
the same source gets in `exec` mode.
Assisted-by: Claude Code:claude-opus-5
* Give compiler-raised SyntaxErrors an end position
`CodegenError` and `SymbolTableError` now carry an `end_location`
alongside `location`, and `CompileError::python_end_location()` returns
it, so errors such as "'await' outside function" set `end_lineno` and
`end_offset` instead of leaving them None.
`SymbolTableBuilder::error_ranged()` builds both positions from a range,
replacing the inline `source_location()` calls at the error sites.
Drop the `expectedFailure` on
`test_exceptions.SyntaxErrorTests.test_file_source`, which now passes.
Assisted-by: Claude Code:claude-opus-5
* Report parser diagnostics with CPython's wording
`InvalidAnnotatedAssignmentTarget` becomes "illegal target for
annotation", `UnexpectedExpressionToken` becomes plain "invalid syntax"
rather than prefixing the parser's text, and the list-recovery
diagnostics ("Expected an expression or a '}'" and its siblings) join the
two that already mapped to "invalid syntax".
Assisted-by: Claude Code:claude-opus-5
* Punctuate the code object repr like CPython
`repr(code)` was missing the comma after the address and escaped the
filename through Rust's Debug formatting.
Drop the `expectedFailure` on the six `test_dis` tests that compare
disassembly text, which now pass.
Assisted-by: Claude Code:claude-opus-5
* Match CPython's parser error positions
A syntax error the parser reports counts its columns in characters, so
`source_location()` converts with UTF-32 rather than UTF-8; an offset
inside a character walks back to where that character starts.
Spans the parser reported differently:
- an error between two tokens covered nothing, and now covers one
character, since the narrowest token still covers one
- a "was never closed" bracket ends at column 0
- an unterminated string literal ends where it starts
- "leading zeros in decimal integer literals" spans the run of zeros
- an exponent with no digits and no sign is blamed on the digit before
the exponent letter, which the tokenizer puts back
Assisted-by: Claude Code:claude-opus-5
* codegen: seek to the finally body's own scopes before copying it
An early exit from a try block emits an extra copy of the finally body.
Nested scopes are handed out by position, and the cursors still sit inside
the try block's own run of scopes there, so the copy took those instead of
the ones the finally body opens: a generator expression got a sibling's
symbol table and raised "the symbol 'k' must be present in the symbol
table", or, where the sibling was a named scope, built a code object with
no `.0` argument that raised UnboundLocalError when it ran.
Seek the cursors to the first scope beginning on or after the finally
body's first line before compiling the copy. The existing restore then
leaves the try statement's own copies starting from the same place.
Assisted-by: Claude
1885 lines
72 KiB
Python
Vendored
1885 lines
72 KiB
Python
Vendored
# -*- coding: utf-8 -*-
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# There are tests here with unicode string literals and
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# identifiers. There's a code in ast.c that was added because of a
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# failure with a non-ascii-only expression. So, I have tests for
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# that. There are workarounds that would let me run tests for that
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# code without unicode identifiers and strings, but just using them
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# directly seems like the easiest and therefore safest thing to do.
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# Unicode identifiers in tests is allowed by PEP 3131.
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import ast
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import datetime
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import dis
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import os
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import re
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import types
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import decimal
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import unittest
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import warnings
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from test import support
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from test.support.os_helper import temp_cwd
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from test.support.script_helper import assert_python_failure, assert_python_ok
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a_global = 'global variable'
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# You could argue that I'm too strict in looking for specific error
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# values with assertRaisesRegex, but without it it's way too easy to
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# make a syntax error in the test strings. Especially with all of the
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# triple quotes, raw strings, backslashes, etc. I think it's a
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# worthwhile tradeoff. When I switched to this method, I found many
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# examples where I wasn't testing what I thought I was.
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class TestCase(unittest.TestCase):
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def assertAllRaise(self, exception_type, regex, error_strings):
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for str in error_strings:
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with self.subTest(str=str):
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with self.assertRaisesRegex(exception_type, regex):
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eval(str)
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def test__format__lookup(self):
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# Make sure __format__ is looked up on the type, not the instance.
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class X:
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def __format__(self, spec):
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return 'class'
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x = X()
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# Add a bound __format__ method to the 'y' instance, but not
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# the 'x' instance.
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y = X()
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y.__format__ = types.MethodType(lambda self, spec: 'instance', y)
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self.assertEqual(f'{y}', format(y))
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self.assertEqual(f'{y}', 'class')
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self.assertEqual(format(x), format(y))
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# __format__ is not called this way, but still make sure it
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# returns what we expect (so we can make sure we're bypassing
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# it).
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self.assertEqual(x.__format__(''), 'class')
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self.assertEqual(y.__format__(''), 'instance')
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# This is how __format__ is actually called.
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self.assertEqual(type(x).__format__(x, ''), 'class')
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self.assertEqual(type(y).__format__(y, ''), 'class')
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def test_ast(self):
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# Inspired by http://bugs.python.org/issue24975
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class X:
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def __init__(self):
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self.called = False
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def __call__(self):
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self.called = True
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return 4
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x = X()
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expr = """
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a = 10
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f'{a * x()}'"""
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t = ast.parse(expr)
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c = compile(t, '', 'exec')
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# Make sure x was not called.
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self.assertFalse(x.called)
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# Actually run the code.
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exec(c)
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# Make sure x was called.
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self.assertTrue(x.called)
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def test_ast_line_numbers(self):
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expr = """
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a = 10
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f'{a * x()}'"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 1)
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self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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# check the binop location
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binop = t.body[1].value.values[0].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3)
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self.assertEqual(binop.left.col_offset, 3)
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self.assertEqual(binop.right.col_offset, 7)
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def test_ast_line_numbers_multiple_formattedvalues(self):
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expr = """
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f'no formatted values'
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f'eggs {a * x()} spam {b + y()}'"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `f'no formatted value'`
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self.assertEqual(type(t.body[0]), ast.Expr)
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self.assertEqual(type(t.body[0].value), ast.JoinedStr)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 4)
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self.assertEqual(type(t.body[1].value.values[0]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[0].value), str)
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self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[2]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[2].value), str)
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self.assertEqual(type(t.body[1].value.values[3]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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self.assertEqual(t.body[1].value.values[1].lineno, 3)
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self.assertEqual(t.body[1].value.values[2].lineno, 3)
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self.assertEqual(t.body[1].value.values[3].lineno, 3)
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# check the first binop location
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binop1 = t.body[1].value.values[1].value
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self.assertEqual(type(binop1), ast.BinOp)
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self.assertEqual(type(binop1.left), ast.Name)
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self.assertEqual(type(binop1.op), ast.Mult)
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self.assertEqual(type(binop1.right), ast.Call)
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self.assertEqual(binop1.lineno, 3)
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self.assertEqual(binop1.left.lineno, 3)
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self.assertEqual(binop1.right.lineno, 3)
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self.assertEqual(binop1.col_offset, 8)
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self.assertEqual(binop1.left.col_offset, 8)
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self.assertEqual(binop1.right.col_offset, 12)
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# check the second binop location
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binop2 = t.body[1].value.values[3].value
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self.assertEqual(type(binop2), ast.BinOp)
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self.assertEqual(type(binop2.left), ast.Name)
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self.assertEqual(type(binop2.op), ast.Add)
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self.assertEqual(type(binop2.right), ast.Call)
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self.assertEqual(binop2.lineno, 3)
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self.assertEqual(binop2.left.lineno, 3)
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self.assertEqual(binop2.right.lineno, 3)
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self.assertEqual(binop2.col_offset, 23)
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self.assertEqual(binop2.left.col_offset, 23)
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self.assertEqual(binop2.right.col_offset, 27)
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def test_ast_line_numbers_nested(self):
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expr = """
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a = 10
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f'{a * f"-{x()}-"}'"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 1)
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self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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# check the binop location
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binop = t.body[1].value.values[0].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.JoinedStr)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3)
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self.assertEqual(binop.left.col_offset, 3)
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self.assertEqual(binop.right.col_offset, 7)
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# check the nested call location
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self.assertEqual(len(binop.right.values), 3)
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self.assertEqual(type(binop.right.values[0]), ast.Constant)
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self.assertEqual(type(binop.right.values[0].value), str)
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self.assertEqual(type(binop.right.values[1]), ast.FormattedValue)
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self.assertEqual(type(binop.right.values[2]), ast.Constant)
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self.assertEqual(type(binop.right.values[2].value), str)
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self.assertEqual(binop.right.values[0].lineno, 3)
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self.assertEqual(binop.right.values[1].lineno, 3)
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self.assertEqual(binop.right.values[2].lineno, 3)
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call = binop.right.values[1].value
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self.assertEqual(type(call), ast.Call)
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self.assertEqual(call.lineno, 3)
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self.assertEqual(call.col_offset, 11)
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def test_ast_line_numbers_duplicate_expression(self):
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expr = """
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a = 10
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f'{a * x()} {a * x()} {a * x()}'
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"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 5)
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self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[1]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[1].value), str)
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self.assertEqual(type(t.body[1].value.values[2]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[3]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[3].value), str)
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self.assertEqual(type(t.body[1].value.values[4]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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self.assertEqual(t.body[1].value.values[1].lineno, 3)
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self.assertEqual(t.body[1].value.values[2].lineno, 3)
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self.assertEqual(t.body[1].value.values[3].lineno, 3)
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self.assertEqual(t.body[1].value.values[4].lineno, 3)
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# check the first binop location
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binop = t.body[1].value.values[0].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3)
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self.assertEqual(binop.left.col_offset, 3)
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self.assertEqual(binop.right.col_offset, 7)
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# check the second binop location
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binop = t.body[1].value.values[2].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 13)
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self.assertEqual(binop.left.col_offset, 13)
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self.assertEqual(binop.right.col_offset, 17)
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# check the third binop location
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binop = t.body[1].value.values[4].value
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self.assertEqual(type(binop), ast.BinOp)
|
||
self.assertEqual(type(binop.left), ast.Name)
|
||
self.assertEqual(type(binop.op), ast.Mult)
|
||
self.assertEqual(type(binop.right), ast.Call)
|
||
self.assertEqual(binop.lineno, 3)
|
||
self.assertEqual(binop.left.lineno, 3)
|
||
self.assertEqual(binop.right.lineno, 3)
|
||
self.assertEqual(binop.col_offset, 23)
|
||
self.assertEqual(binop.left.col_offset, 23)
|
||
self.assertEqual(binop.right.col_offset, 27)
|
||
|
||
def test_ast_numbers_fstring_with_formatting(self):
|
||
|
||
t = ast.parse('f"Here is that pesky {xxx:.3f} again"')
|
||
self.assertEqual(len(t.body), 1)
|
||
self.assertEqual(t.body[0].lineno, 1)
|
||
|
||
self.assertEqual(type(t.body[0]), ast.Expr)
|
||
self.assertEqual(type(t.body[0].value), ast.JoinedStr)
|
||
self.assertEqual(len(t.body[0].value.values), 3)
|
||
|
||
self.assertEqual(type(t.body[0].value.values[0]), ast.Constant)
|
||
self.assertEqual(type(t.body[0].value.values[1]), ast.FormattedValue)
|
||
self.assertEqual(type(t.body[0].value.values[2]), ast.Constant)
|
||
|
||
_, expr, _ = t.body[0].value.values
|
||
|
||
name = expr.value
|
||
self.assertEqual(type(name), ast.Name)
|
||
self.assertEqual(name.lineno, 1)
|
||
self.assertEqual(name.end_lineno, 1)
|
||
self.assertEqual(name.col_offset, 22)
|
||
self.assertEqual(name.end_col_offset, 25)
|
||
|
||
def test_ast_line_numbers_multiline_fstring(self):
|
||
# See bpo-30465 for details.
|
||
expr = """
|
||
a = 10
|
||
f'''
|
||
{a
|
||
*
|
||
x()}
|
||
non-important content
|
||
'''
|
||
"""
|
||
t = ast.parse(expr)
|
||
self.assertEqual(type(t), ast.Module)
|
||
self.assertEqual(len(t.body), 2)
|
||
# check `a = 10`
|
||
self.assertEqual(type(t.body[0]), ast.Assign)
|
||
self.assertEqual(t.body[0].lineno, 2)
|
||
# check `f'...'`
|
||
self.assertEqual(type(t.body[1]), ast.Expr)
|
||
self.assertEqual(type(t.body[1].value), ast.JoinedStr)
|
||
self.assertEqual(len(t.body[1].value.values), 3)
|
||
self.assertEqual(type(t.body[1].value.values[0]), ast.Constant)
|
||
self.assertEqual(type(t.body[1].value.values[0].value), str)
|
||
self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue)
|
||
self.assertEqual(type(t.body[1].value.values[2]), ast.Constant)
|
||
self.assertEqual(type(t.body[1].value.values[2].value), str)
|
||
self.assertEqual(t.body[1].lineno, 3)
|
||
self.assertEqual(t.body[1].value.lineno, 3)
|
||
self.assertEqual(t.body[1].value.values[0].lineno, 3)
|
||
self.assertEqual(t.body[1].value.values[1].lineno, 4)
|
||
self.assertEqual(t.body[1].value.values[2].lineno, 6)
|
||
self.assertEqual(t.body[1].col_offset, 0)
|
||
self.assertEqual(t.body[1].value.col_offset, 0)
|
||
self.assertEqual(t.body[1].value.values[0].col_offset, 4)
|
||
self.assertEqual(t.body[1].value.values[1].col_offset, 2)
|
||
self.assertEqual(t.body[1].value.values[2].col_offset, 11)
|
||
# NOTE: the following lineno information and col_offset is correct for
|
||
# expressions within FormattedValues.
|
||
binop = t.body[1].value.values[1].value
|
||
self.assertEqual(type(binop), ast.BinOp)
|
||
self.assertEqual(type(binop.left), ast.Name)
|
||
self.assertEqual(type(binop.op), ast.Mult)
|
||
self.assertEqual(type(binop.right), ast.Call)
|
||
self.assertEqual(binop.lineno, 4)
|
||
self.assertEqual(binop.left.lineno, 4)
|
||
self.assertEqual(binop.right.lineno, 6)
|
||
self.assertEqual(binop.col_offset, 3)
|
||
self.assertEqual(binop.left.col_offset, 3)
|
||
self.assertEqual(binop.right.col_offset, 7)
|
||
|
||
expr = """
|
||
a = f'''
|
||
{blech}
|
||
'''
|
||
"""
|
||
t = ast.parse(expr)
|
||
self.assertEqual(type(t), ast.Module)
|
||
self.assertEqual(len(t.body), 1)
|
||
# Check f'...'
|
||
self.assertEqual(type(t.body[0]), ast.Assign)
|
||
self.assertEqual(type(t.body[0].value), ast.JoinedStr)
|
||
self.assertEqual(len(t.body[0].value.values), 3)
|
||
self.assertEqual(type(t.body[0].value.values[1]), ast.FormattedValue)
|
||
self.assertEqual(t.body[0].lineno, 2)
|
||
self.assertEqual(t.body[0].value.lineno, 2)
|
||
self.assertEqual(t.body[0].value.values[0].lineno, 2)
|
||
self.assertEqual(t.body[0].value.values[1].lineno, 3)
|
||
self.assertEqual(t.body[0].value.values[2].lineno, 3)
|
||
self.assertEqual(t.body[0].col_offset, 0)
|
||
self.assertEqual(t.body[0].value.col_offset, 4)
|
||
self.assertEqual(t.body[0].value.values[0].col_offset, 8)
|
||
self.assertEqual(t.body[0].value.values[1].col_offset, 10)
|
||
self.assertEqual(t.body[0].value.values[2].col_offset, 17)
|
||
# Check {blech}
|
||
self.assertEqual(t.body[0].value.values[1].value.lineno, 3)
|
||
self.assertEqual(t.body[0].value.values[1].value.end_lineno, 3)
|
||
self.assertEqual(t.body[0].value.values[1].value.col_offset, 11)
|
||
self.assertEqual(t.body[0].value.values[1].value.end_col_offset, 16)
|
||
|
||
def test_ast_line_numbers_with_parentheses(self):
|
||
expr = """
|
||
x = (
|
||
f" {test(t)}"
|
||
)"""
|
||
t = ast.parse(expr)
|
||
self.assertEqual(type(t), ast.Module)
|
||
self.assertEqual(len(t.body), 1)
|
||
# check the joinedstr location
|
||
joinedstr = t.body[0].value
|
||
self.assertEqual(type(joinedstr), ast.JoinedStr)
|
||
self.assertEqual(joinedstr.lineno, 3)
|
||
self.assertEqual(joinedstr.end_lineno, 3)
|
||
self.assertEqual(joinedstr.col_offset, 4)
|
||
self.assertEqual(joinedstr.end_col_offset, 17)
|
||
# check the formatted value location
|
||
fv = t.body[0].value.values[1]
|
||
self.assertEqual(type(fv), ast.FormattedValue)
|
||
self.assertEqual(fv.lineno, 3)
|
||
self.assertEqual(fv.end_lineno, 3)
|
||
self.assertEqual(fv.col_offset, 7)
|
||
self.assertEqual(fv.end_col_offset, 16)
|
||
# check the test(t) location
|
||
call = t.body[0].value.values[1].value
|
||
self.assertEqual(type(call), ast.Call)
|
||
self.assertEqual(call.lineno, 3)
|
||
self.assertEqual(call.end_lineno, 3)
|
||
self.assertEqual(call.col_offset, 8)
|
||
self.assertEqual(call.end_col_offset, 15)
|
||
|
||
expr = """
|
||
x = (
|
||
u'wat',
|
||
u"wat",
|
||
b'wat',
|
||
b"wat",
|
||
f'wat',
|
||
f"wat",
|
||
)
|
||
|
||
y = (
|
||
u'''wat''',
|
||
u\"\"\"wat\"\"\",
|
||
b'''wat''',
|
||
b\"\"\"wat\"\"\",
|
||
f'''wat''',
|
||
f\"\"\"wat\"\"\",
|
||
)
|
||
"""
|
||
t = ast.parse(expr)
|
||
self.assertEqual(type(t), ast.Module)
|
||
self.assertEqual(len(t.body), 2)
|
||
x, y = t.body
|
||
|
||
# Check the single quoted string offsets first.
|
||
offsets = [
|
||
(elt.col_offset, elt.end_col_offset)
|
||
for elt in x.value.elts
|
||
]
|
||
self.assertTrue(all(
|
||
offset == (4, 10)
|
||
for offset in offsets
|
||
))
|
||
|
||
# Check the triple quoted string offsets.
|
||
offsets = [
|
||
(elt.col_offset, elt.end_col_offset)
|
||
for elt in y.value.elts
|
||
]
|
||
self.assertTrue(all(
|
||
offset == (4, 14)
|
||
for offset in offsets
|
||
))
|
||
|
||
expr = """
|
||
x = (
|
||
'PERL_MM_OPT', (
|
||
f'wat'
|
||
f'some_string={f(x)} '
|
||
f'wat'
|
||
),
|
||
)
|
||
"""
|
||
t = ast.parse(expr)
|
||
self.assertEqual(type(t), ast.Module)
|
||
self.assertEqual(len(t.body), 1)
|
||
# check the fstring
|
||
fstring = t.body[0].value.elts[1]
|
||
self.assertEqual(type(fstring), ast.JoinedStr)
|
||
self.assertEqual(len(fstring.values), 3)
|
||
wat1, middle, wat2 = fstring.values
|
||
# check the first wat
|
||
self.assertEqual(type(wat1), ast.Constant)
|
||
self.assertEqual(wat1.lineno, 4)
|
||
self.assertEqual(wat1.end_lineno, 5)
|
||
self.assertEqual(wat1.col_offset, 14)
|
||
self.assertEqual(wat1.end_col_offset, 26)
|
||
# check the call
|
||
call = middle.value
|
||
self.assertEqual(type(call), ast.Call)
|
||
self.assertEqual(call.lineno, 5)
|
||
self.assertEqual(call.end_lineno, 5)
|
||
self.assertEqual(call.col_offset, 27)
|
||
self.assertEqual(call.end_col_offset, 31)
|
||
# check the second wat
|
||
self.assertEqual(type(wat2), ast.Constant)
|
||
self.assertEqual(wat2.lineno, 5)
|
||
self.assertEqual(wat2.end_lineno, 6)
|
||
self.assertEqual(wat2.col_offset, 32)
|
||
# wat ends at the offset 17, but the whole f-string
|
||
# ends at the offset 18 (since the quote is part of the
|
||
# f-string but not the wat string)
|
||
self.assertEqual(wat2.end_col_offset, 17)
|
||
self.assertEqual(fstring.end_col_offset, 18)
|
||
|
||
def test_ast_fstring_empty_format_spec(self):
|
||
expr = "f'{expr:}'"
|
||
|
||
mod = ast.parse(expr)
|
||
self.assertEqual(type(mod), ast.Module)
|
||
self.assertEqual(len(mod.body), 1)
|
||
|
||
fstring = mod.body[0].value
|
||
self.assertEqual(type(fstring), ast.JoinedStr)
|
||
self.assertEqual(len(fstring.values), 1)
|
||
|
||
fv = fstring.values[0]
|
||
self.assertEqual(type(fv), ast.FormattedValue)
|
||
|
||
format_spec = fv.format_spec
|
||
self.assertEqual(type(format_spec), ast.JoinedStr)
|
||
self.assertEqual(len(format_spec.values), 0)
|
||
|
||
def test_ast_fstring_format_spec(self):
|
||
expr = "f'{1:{name}}'"
|
||
|
||
mod = ast.parse(expr)
|
||
self.assertEqual(type(mod), ast.Module)
|
||
self.assertEqual(len(mod.body), 1)
|
||
|
||
fstring = mod.body[0].value
|
||
self.assertEqual(type(fstring), ast.JoinedStr)
|
||
self.assertEqual(len(fstring.values), 1)
|
||
|
||
fv = fstring.values[0]
|
||
self.assertEqual(type(fv), ast.FormattedValue)
|
||
|
||
format_spec = fv.format_spec
|
||
self.assertEqual(type(format_spec), ast.JoinedStr)
|
||
self.assertEqual(len(format_spec.values), 1)
|
||
|
||
format_spec_value = format_spec.values[0]
|
||
self.assertEqual(type(format_spec_value), ast.FormattedValue)
|
||
self.assertEqual(format_spec_value.value.id, 'name')
|
||
|
||
expr = "f'{1:{name1}{name2}}'"
|
||
|
||
mod = ast.parse(expr)
|
||
self.assertEqual(type(mod), ast.Module)
|
||
self.assertEqual(len(mod.body), 1)
|
||
|
||
fstring = mod.body[0].value
|
||
self.assertEqual(type(fstring), ast.JoinedStr)
|
||
self.assertEqual(len(fstring.values), 1)
|
||
|
||
fv = fstring.values[0]
|
||
self.assertEqual(type(fv), ast.FormattedValue)
|
||
|
||
format_spec = fv.format_spec
|
||
self.assertEqual(type(format_spec), ast.JoinedStr)
|
||
self.assertEqual(len(format_spec.values), 2)
|
||
|
||
format_spec_value = format_spec.values[0]
|
||
self.assertEqual(type(format_spec_value), ast.FormattedValue)
|
||
self.assertEqual(format_spec_value.value.id, 'name1')
|
||
|
||
format_spec_value = format_spec.values[1]
|
||
self.assertEqual(type(format_spec_value), ast.FormattedValue)
|
||
self.assertEqual(format_spec_value.value.id, 'name2')
|
||
|
||
|
||
def test_docstring(self):
|
||
def f():
|
||
f'''Not a docstring'''
|
||
self.assertIsNone(f.__doc__)
|
||
def g():
|
||
'''Not a docstring''' \
|
||
f''
|
||
self.assertIsNone(g.__doc__)
|
||
|
||
def test_literal_eval(self):
|
||
with self.assertRaisesRegex(ValueError, 'malformed node or string'):
|
||
ast.literal_eval("f'x'")
|
||
|
||
def test_ast_compile_time_concat(self):
|
||
x = ['']
|
||
|
||
expr = """x[0] = 'foo' f'{3}'"""
|
||
t = ast.parse(expr)
|
||
c = compile(t, '', 'exec')
|
||
exec(c)
|
||
self.assertEqual(x[0], 'foo3')
|
||
|
||
def test_compile_time_concat_errors(self):
|
||
self.assertAllRaise(SyntaxError,
|
||
'cannot mix bytes and nonbytes literals',
|
||
[r"""f'' b''""",
|
||
r"""b'' f''""",
|
||
])
|
||
|
||
def test_literal(self):
|
||
self.assertEqual(f'', '')
|
||
self.assertEqual(f'a', 'a')
|
||
self.assertEqual(f' ', ' ')
|
||
|
||
def test_unterminated_string(self):
|
||
self.assertAllRaise(SyntaxError, 'unterminated string',
|
||
[r"""f'{"x'""",
|
||
r"""f'{"x}'""",
|
||
r"""f'{("x'""",
|
||
r"""f'{("x}'""",
|
||
])
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
@unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
|
||
def test_mismatched_parens(self):
|
||
self.assertAllRaise(SyntaxError, r"closing parenthesis '\}' "
|
||
r"does not match opening parenthesis '\('",
|
||
["f'{((}'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, r"closing parenthesis '\)' "
|
||
r"does not match opening parenthesis '\['",
|
||
["f'{a[4)}'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, r"closing parenthesis '\]' "
|
||
r"does not match opening parenthesis '\('",
|
||
["f'{a(4]}'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, r"closing parenthesis '\}' "
|
||
r"does not match opening parenthesis '\['",
|
||
["f'{a[4}'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, r"closing parenthesis '\}' "
|
||
r"does not match opening parenthesis '\('",
|
||
["f'{a(4}'",
|
||
])
|
||
self.assertRaises(SyntaxError, eval, "f'{" + "("*20 + "}'")
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: No exception raised
|
||
@unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
|
||
def test_fstring_nested_too_deeply(self):
|
||
def raises_syntax_or_memory_error(txt):
|
||
try:
|
||
eval(txt)
|
||
except SyntaxError:
|
||
pass
|
||
except MemoryError:
|
||
pass
|
||
except Exception as ex:
|
||
self.fail(f"Should raise SyntaxError or MemoryError, not {type(ex)}")
|
||
else:
|
||
self.fail("No exception raised")
|
||
|
||
raises_syntax_or_memory_error('f"{1+2:{1+2:{1+1:{1}}}}"')
|
||
|
||
def create_nested_fstring(n):
|
||
if n == 0:
|
||
return "1+1"
|
||
prev = create_nested_fstring(n-1)
|
||
return f'f"{{{prev}}}"'
|
||
|
||
raises_syntax_or_memory_error(create_nested_fstring(160))
|
||
raises_syntax_or_memory_error("f'{" + "("*100 + "}'")
|
||
raises_syntax_or_memory_error("f'{" + "("*1000 + "}'")
|
||
raises_syntax_or_memory_error("f'{" + "("*10_000 + "}'")
|
||
|
||
def test_syntax_error_in_nested_fstring(self):
|
||
# See gh-104016 for more information on this crash
|
||
self.assertAllRaise(SyntaxError,
|
||
"invalid syntax",
|
||
['f"{1 1:' + ('{f"1:' * 199)])
|
||
|
||
def test_double_braces(self):
|
||
self.assertEqual(f'{{', '{')
|
||
self.assertEqual(f'a{{', 'a{')
|
||
self.assertEqual(f'{{b', '{b')
|
||
self.assertEqual(f'a{{b', 'a{b')
|
||
self.assertEqual(f'}}', '}')
|
||
self.assertEqual(f'a}}', 'a}')
|
||
self.assertEqual(f'}}b', '}b')
|
||
self.assertEqual(f'a}}b', 'a}b')
|
||
self.assertEqual(f'{{}}', '{}')
|
||
self.assertEqual(f'a{{}}', 'a{}')
|
||
self.assertEqual(f'{{b}}', '{b}')
|
||
self.assertEqual(f'{{}}c', '{}c')
|
||
self.assertEqual(f'a{{b}}', 'a{b}')
|
||
self.assertEqual(f'a{{}}c', 'a{}c')
|
||
self.assertEqual(f'{{b}}c', '{b}c')
|
||
self.assertEqual(f'a{{b}}c', 'a{b}c')
|
||
|
||
self.assertEqual(f'{{{10}', '{10')
|
||
self.assertEqual(f'}}{10}', '}10')
|
||
self.assertEqual(f'}}{{{10}', '}{10')
|
||
self.assertEqual(f'}}a{{{10}', '}a{10')
|
||
|
||
self.assertEqual(f'{10}{{', '10{')
|
||
self.assertEqual(f'{10}}}', '10}')
|
||
self.assertEqual(f'{10}}}{{', '10}{')
|
||
self.assertEqual(f'{10}}}a{{' '}', '10}a{}')
|
||
|
||
# Inside of strings, don't interpret doubled brackets.
|
||
self.assertEqual(f'{"{{}}"}', '{{}}')
|
||
|
||
self.assertAllRaise(TypeError, 'unhashable type',
|
||
["f'{ {{}} }'", # dict in a set
|
||
])
|
||
|
||
def test_compile_time_concat(self):
|
||
x = 'def'
|
||
self.assertEqual('abc' f'## {x}ghi', 'abc## defghi')
|
||
self.assertEqual('abc' f'{x}' 'ghi', 'abcdefghi')
|
||
self.assertEqual('abc' f'{x}' 'gh' f'i{x:4}', 'abcdefghidef ')
|
||
self.assertEqual('{x}' f'{x}', '{x}def')
|
||
self.assertEqual('{x' f'{x}', '{xdef')
|
||
self.assertEqual('{x}' f'{x}', '{x}def')
|
||
self.assertEqual('{{x}}' f'{x}', '{{x}}def')
|
||
self.assertEqual('{{x' f'{x}', '{{xdef')
|
||
self.assertEqual('x}}' f'{x}', 'x}}def')
|
||
self.assertEqual(f'{x}' 'x}}', 'defx}}')
|
||
self.assertEqual(f'{x}' '', 'def')
|
||
self.assertEqual('' f'{x}' '', 'def')
|
||
self.assertEqual('' f'{x}', 'def')
|
||
self.assertEqual(f'{x}' '2', 'def2')
|
||
self.assertEqual('1' f'{x}' '2', '1def2')
|
||
self.assertEqual('1' f'{x}', '1def')
|
||
self.assertEqual(f'{x}' f'-{x}', 'def-def')
|
||
self.assertEqual('' f'', '')
|
||
self.assertEqual('' f'' '', '')
|
||
self.assertEqual('' f'' '' f'', '')
|
||
self.assertEqual(f'', '')
|
||
self.assertEqual(f'' '', '')
|
||
self.assertEqual(f'' '' f'', '')
|
||
self.assertEqual(f'' '' f'' '', '')
|
||
|
||
# This is not really [f'{'] + [f'}'] since we treat the inside
|
||
# of braces as a purely new context, so it is actually f'{ and
|
||
# then eval(' f') (a valid expression) and then }' which would
|
||
# constitute a valid f-string.
|
||
self.assertEqual(f'{' f'}', ' f')
|
||
|
||
self.assertAllRaise(SyntaxError, "expecting '}'",
|
||
['''f'{3' f"}"''', # can't concat to get a valid f-string
|
||
])
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_comments(self):
|
||
# These aren't comments, since they're in strings.
|
||
d = {'#': 'hash'}
|
||
self.assertEqual(f'{"#"}', '#')
|
||
self.assertEqual(f'{d["#"]}', 'hash')
|
||
|
||
self.assertAllRaise(SyntaxError, "'{' was never closed",
|
||
["f'{1#}'", # error because everything after '#' is a comment
|
||
"f'{#}'",
|
||
"f'one: {1#}'",
|
||
"f'{1# one} {2 this is a comment still#}'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, r"f-string: unmatched '\)'",
|
||
["f'{)#}'", # When wrapped in parens, this becomes
|
||
# '()#)'. Make sure that doesn't compile.
|
||
])
|
||
self.assertEqual(f'''A complex trick: {
|
||
2 # two
|
||
}''', 'A complex trick: 2')
|
||
self.assertEqual(f'''
|
||
{
|
||
40 # forty
|
||
+ # plus
|
||
2 # two
|
||
}''', '\n42')
|
||
self.assertEqual(f'''
|
||
{
|
||
40 # forty
|
||
+ # plus
|
||
2 # two
|
||
}''', '\n42')
|
||
|
||
self.assertEqual(f'''
|
||
# this is not a comment
|
||
{ # the following operation it's
|
||
3 # this is a number
|
||
* 2}''', '\n# this is not a comment\n6')
|
||
self.assertEqual(f'''
|
||
{# f'a {comment}'
|
||
86 # constant
|
||
# nothing more
|
||
}''', '\n86')
|
||
|
||
self.assertAllRaise(SyntaxError, r"f-string: valid expression required before '}'",
|
||
["""f'''
|
||
{
|
||
# only a comment
|
||
}'''
|
||
""", # this is equivalent to f'{}'
|
||
])
|
||
|
||
def test_many_expressions(self):
|
||
# Create a string with many expressions in it. Note that
|
||
# because we have a space in here as a literal, we're actually
|
||
# going to use twice as many ast nodes: one for each literal
|
||
# plus one for each expression.
|
||
def build_fstr(n, extra=''):
|
||
return "f'" + ('{x} ' * n) + extra + "'"
|
||
|
||
x = 'X'
|
||
width = 1
|
||
|
||
# Test around 256.
|
||
for i in range(250, 260):
|
||
self.assertEqual(eval(build_fstr(i)), (x+' ')*i)
|
||
|
||
# Test concatenating 2 largs fstrings.
|
||
self.assertEqual(eval(build_fstr(255)*256), (x+' ')*(255*256))
|
||
|
||
s = build_fstr(253, '{x:{width}} ')
|
||
self.assertEqual(eval(s), (x+' ')*254)
|
||
|
||
# Test lots of expressions and constants, concatenated.
|
||
s = "f'{1}' 'x' 'y'" * 1024
|
||
self.assertEqual(eval(s), '1xy' * 1024)
|
||
|
||
def test_format_specifier_expressions(self):
|
||
width = 10
|
||
precision = 4
|
||
value = decimal.Decimal('12.34567')
|
||
self.assertEqual(f'result: {value:{width}.{precision}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{width!r}.{precision}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{width:0}.{precision:1}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{1}{0:0}.{precision:1}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{ 1}{ 0:0}.{ precision:1}}', 'result: 12.35')
|
||
self.assertEqual(f'{10:#{1}0x}', ' 0xa')
|
||
self.assertEqual(f'{10:{"#"}1{0}{"x"}}', ' 0xa')
|
||
self.assertEqual(f'{-10:-{"#"}1{0}x}', ' -0xa')
|
||
self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', ' -0xa')
|
||
self.assertEqual(f'{10:#{3 != {4:5} and width}x}', ' 0xa')
|
||
self.assertEqual(f'result: {value:{width:{0}}.{precision:1}}', 'result: 12.35')
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting ':' or '}'",
|
||
["""f'{"s"!r{":10"}}'""",
|
||
# This looks like a nested format spec.
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: expecting a valid expression after '{'",
|
||
[# Invalid syntax inside a nested spec.
|
||
"f'{4:{/5}}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
|
||
[# No expansion inside conversion or for
|
||
# the : or ! itself.
|
||
"""f'{"s"!{"r"}}'""",
|
||
])
|
||
|
||
def test_custom_format_specifier(self):
|
||
class CustomFormat:
|
||
def __format__(self, format_spec):
|
||
return format_spec
|
||
|
||
self.assertEqual(f'{CustomFormat():\n}', '\n')
|
||
self.assertEqual(f'{CustomFormat():\u2603}', '☃')
|
||
with self.assertWarns(SyntaxWarning):
|
||
exec(r'f"{F():¯\_(ツ)_/¯}"', {'F': CustomFormat})
|
||
|
||
def test_side_effect_order(self):
|
||
class X:
|
||
def __init__(self):
|
||
self.i = 0
|
||
def __format__(self, spec):
|
||
self.i += 1
|
||
return str(self.i)
|
||
|
||
x = X()
|
||
self.assertEqual(f'{x} {x}', '1 2')
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_missing_expression(self):
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: valid expression required before '}'",
|
||
["f'{}'",
|
||
"f'{ }'"
|
||
"f' {} '",
|
||
"f'{10:{ }}'",
|
||
"f' { } '",
|
||
|
||
# The Python parser ignores also the following
|
||
# whitespace characters in additional to a space.
|
||
"f'''{\t\f\r\n}'''",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: valid expression required before '!'",
|
||
["f'{!r}'",
|
||
"f'{ !r}'",
|
||
"f'{!}'",
|
||
"f'''{\t\f\r\n!a}'''",
|
||
|
||
# Catch empty expression before the
|
||
# missing closing brace.
|
||
"f'{!'",
|
||
"f'{!s:'",
|
||
|
||
# Catch empty expression before the
|
||
# invalid conversion.
|
||
"f'{!x}'",
|
||
"f'{ !xr}'",
|
||
"f'{!x:}'",
|
||
"f'{!x:a}'",
|
||
"f'{ !xr:}'",
|
||
"f'{ !xr:a}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: valid expression required before ':'",
|
||
["f'{:}'",
|
||
"f'{ :!}'",
|
||
"f'{:2}'",
|
||
"f'''{\t\f\r\n:a}'''",
|
||
"f'{:'",
|
||
"F'{[F'{:'}[F'{:'}]]]",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: valid expression required before '='",
|
||
["f'{=}'",
|
||
"f'{ =}'",
|
||
"f'{ =:}'",
|
||
"f'{ =!}'",
|
||
"f'''{\t\f\r\n=}'''",
|
||
"f'{='",
|
||
])
|
||
|
||
# Different error message is raised for other whitespace characters.
|
||
self.assertAllRaise(SyntaxError, r"invalid non-printable character U\+00A0",
|
||
["f'''{\xa0}'''",
|
||
"\xa0",
|
||
])
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_parens_in_expressions(self):
|
||
self.assertEqual(f'{3,}', '(3,)')
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: expecting a valid expression after '{'",
|
||
["f'{,}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, r"f-string: unmatched '\)'",
|
||
["f'{3)+(4}'",
|
||
])
|
||
|
||
def test_newlines_before_syntax_error(self):
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: expecting a valid expression after '{'",
|
||
["f'{.}'", "\nf'{.}'", "\n\nf'{.}'"])
|
||
|
||
def test_backslashes_in_string_part(self):
|
||
self.assertEqual(f'\t', '\t')
|
||
self.assertEqual(r'\t', '\\t')
|
||
self.assertEqual(rf'\t', '\\t')
|
||
self.assertEqual(f'{2}\t', '2\t')
|
||
self.assertEqual(f'{2}\t{3}', '2\t3')
|
||
self.assertEqual(f'\t{3}', '\t3')
|
||
|
||
self.assertEqual(f'\u0394', '\u0394')
|
||
self.assertEqual(r'\u0394', '\\u0394')
|
||
self.assertEqual(rf'\u0394', '\\u0394')
|
||
self.assertEqual(f'{2}\u0394', '2\u0394')
|
||
self.assertEqual(f'{2}\u0394{3}', '2\u03943')
|
||
self.assertEqual(f'\u0394{3}', '\u03943')
|
||
|
||
self.assertEqual(f'\U00000394', '\u0394')
|
||
self.assertEqual(r'\U00000394', '\\U00000394')
|
||
self.assertEqual(rf'\U00000394', '\\U00000394')
|
||
self.assertEqual(f'{2}\U00000394', '2\u0394')
|
||
self.assertEqual(f'{2}\U00000394{3}', '2\u03943')
|
||
self.assertEqual(f'\U00000394{3}', '\u03943')
|
||
|
||
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}', '\u0394')
|
||
self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
|
||
self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}{3}', '2\u03943')
|
||
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}{3}', '\u03943')
|
||
self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
|
||
self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}3', '2\u03943')
|
||
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}3', '\u03943')
|
||
|
||
self.assertEqual(f'\x20', ' ')
|
||
self.assertEqual(r'\x20', '\\x20')
|
||
self.assertEqual(rf'\x20', '\\x20')
|
||
self.assertEqual(f'{2}\x20', '2 ')
|
||
self.assertEqual(f'{2}\x20{3}', '2 3')
|
||
self.assertEqual(f'\x20{3}', ' 3')
|
||
|
||
self.assertEqual(f'2\x20', '2 ')
|
||
self.assertEqual(f'2\x203', '2 3')
|
||
self.assertEqual(f'\x203', ' 3')
|
||
|
||
with self.assertWarns(SyntaxWarning): # invalid escape sequence
|
||
value = eval(r"f'\{6*7}'")
|
||
self.assertEqual(value, '\\42')
|
||
with self.assertWarns(SyntaxWarning): # invalid escape sequence
|
||
value = eval(r"f'\g'")
|
||
self.assertEqual(value, '\\g')
|
||
self.assertEqual(f'\\{6*7}', '\\42')
|
||
self.assertEqual(fr'\{6*7}', '\\42')
|
||
|
||
AMPERSAND = 'spam'
|
||
# Get the right unicode character (&), or pick up local variable
|
||
# depending on the number of backslashes.
|
||
self.assertEqual(f'\N{AMPERSAND}', '&')
|
||
self.assertEqual(f'\\N{AMPERSAND}', '\\Nspam')
|
||
self.assertEqual(fr'\N{AMPERSAND}', '\\Nspam')
|
||
self.assertEqual(f'\\\N{AMPERSAND}', '\\&')
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_misformed_unicode_character_name(self):
|
||
# These test are needed because unicode names are parsed
|
||
# differently inside f-strings.
|
||
self.assertAllRaise(SyntaxError, r"\(unicode error\) 'unicodeescape' codec can't decode bytes in position .*: malformed \\N character escape",
|
||
[r"f'\N'",
|
||
r"f'\N '",
|
||
r"f'\N '", # See bpo-46503.
|
||
r"f'\N{'",
|
||
r"f'\N{GREEK CAPITAL LETTER DELTA'",
|
||
|
||
# Here are the non-f-string versions,
|
||
# which should give the same errors.
|
||
r"'\N'",
|
||
r"'\N '",
|
||
r"'\N '",
|
||
r"'\N{'",
|
||
r"'\N{GREEK CAPITAL LETTER DELTA'",
|
||
])
|
||
|
||
def test_backslashes_in_expression_part(self):
|
||
self.assertEqual(f"{(
|
||
1 +
|
||
2
|
||
)}", "3")
|
||
|
||
self.assertEqual("\N{LEFT CURLY BRACKET}", '{')
|
||
self.assertEqual(f'{"\N{LEFT CURLY BRACKET}"}', '{')
|
||
self.assertEqual(rf'{"\N{LEFT CURLY BRACKET}"}', '{')
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: valid expression required before '}'",
|
||
["f'{\n}'",
|
||
])
|
||
|
||
def test_invalid_backslashes_inside_fstring_context(self):
|
||
# All of these variations are invalid python syntax,
|
||
# so they are also invalid in f-strings as well.
|
||
cases = [
|
||
formatting.format(expr=expr)
|
||
for formatting in [
|
||
"{expr}",
|
||
"f'{{{expr}}}'",
|
||
"rf'{{{expr}}}'",
|
||
]
|
||
for expr in [
|
||
r"\'a\'",
|
||
r"\t3",
|
||
r"\\"[0],
|
||
]
|
||
]
|
||
self.assertAllRaise(SyntaxError, 'unexpected character after line continuation',
|
||
cases)
|
||
|
||
def test_no_escapes_for_braces(self):
|
||
"""
|
||
Only literal curly braces begin an expression.
|
||
"""
|
||
# \x7b is '{'.
|
||
self.assertEqual(f'\x7b1+1}}', '{1+1}')
|
||
self.assertEqual(f'\x7b1+1', '{1+1')
|
||
self.assertEqual(f'\u007b1+1', '{1+1')
|
||
self.assertEqual(f'\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}', '{1+1}')
|
||
|
||
def test_newlines_in_expressions(self):
|
||
self.assertEqual(f'{0}', '0')
|
||
self.assertEqual(rf'''{3+
|
||
4}''', '7')
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: "f-string: expecting a valid expression after '{'" does not match "invalid syntax (<string>, line 1)"
|
||
def test_lambda(self):
|
||
x = 5
|
||
self.assertEqual(f'{(lambda y:x*y)("8")!r}', "'88888'")
|
||
self.assertEqual(f'{(lambda y:x*y)("8")!r:10}', "'88888' ")
|
||
self.assertEqual(f'{(lambda y:x*y)("8"):10}', "88888 ")
|
||
|
||
# lambda doesn't work without parens, because the colon
|
||
# makes the parser think it's a format_spec
|
||
# emit warning if we can match a format_spec
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: lambda expressions are not allowed "
|
||
"without parentheses",
|
||
["f'{lambda x:x}'",
|
||
"f'{lambda :x}'",
|
||
"f'{lambda *arg, :x}'",
|
||
"f'{1, lambda:x}'",
|
||
"f'{lambda x:}'",
|
||
"f'{lambda :}'",
|
||
])
|
||
# Ensure the detection of invalid lambdas doesn't trigger detection
|
||
# for valid lambdas in the second error pass
|
||
with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
|
||
compile("lambda name_3=f'{name_4}': {name_3}\n1 $ 1", "<string>", "exec")
|
||
|
||
# but don't emit the paren warning in general cases
|
||
with self.assertRaisesRegex(SyntaxError, "f-string: expecting a valid expression after '{'"):
|
||
eval("f'{+ lambda:None}'")
|
||
|
||
def test_valid_prefixes(self):
|
||
self.assertEqual(F'{1}', "1")
|
||
self.assertEqual(FR'{2}', "2")
|
||
self.assertEqual(fR'{3}', "3")
|
||
|
||
def test_roundtrip_raw_quotes(self):
|
||
self.assertEqual(fr"\'", "\\'")
|
||
self.assertEqual(fr'\"', '\\"')
|
||
self.assertEqual(fr'\"\'', '\\"\\\'')
|
||
self.assertEqual(fr'\'\"', '\\\'\\"')
|
||
self.assertEqual(fr'\"\'\"', '\\"\\\'\\"')
|
||
self.assertEqual(fr'\'\"\'', '\\\'\\"\\\'')
|
||
self.assertEqual(fr'\"\'\"\'', '\\"\\\'\\"\\\'')
|
||
|
||
def test_fstring_backslash_before_double_bracket(self):
|
||
deprecated_cases = [
|
||
(r"f'\{{\}}'", '\\{\\}'),
|
||
(r"f'\{{'", '\\{'),
|
||
(r"f'\{{{1+1}'", '\\{2'),
|
||
(r"f'\}}{1+1}'", '\\}2'),
|
||
(r"f'{1+1}\}}'", '2\\}')
|
||
]
|
||
for case, expected_result in deprecated_cases:
|
||
with self.subTest(case=case, expected_result=expected_result):
|
||
with self.assertWarns(SyntaxWarning):
|
||
result = eval(case)
|
||
self.assertEqual(result, expected_result)
|
||
self.assertEqual(fr'\{{\}}', '\\{\\}')
|
||
self.assertEqual(fr'\{{', '\\{')
|
||
self.assertEqual(fr'\{{{1+1}', '\\{2')
|
||
self.assertEqual(fr'\}}{1+1}', '\\}2')
|
||
self.assertEqual(fr'{1+1}\}}', '2\\}')
|
||
|
||
def test_fstring_backslash_before_double_bracket_warns_once(self):
|
||
with self.assertWarns(SyntaxWarning) as w:
|
||
eval(r"f'\{{'")
|
||
self.assertEqual(len(w.warnings), 1)
|
||
self.assertEqual(w.warnings[0].category, SyntaxWarning)
|
||
|
||
def test_fstring_backslash_prefix_raw(self):
|
||
self.assertEqual(f'\\', '\\')
|
||
self.assertEqual(f'\\\\', '\\\\')
|
||
self.assertEqual(fr'\\', r'\\')
|
||
self.assertEqual(fr'\\\\', r'\\\\')
|
||
self.assertEqual(rf'\\', r'\\')
|
||
self.assertEqual(rf'\\\\', r'\\\\')
|
||
self.assertEqual(Rf'\\', R'\\')
|
||
self.assertEqual(Rf'\\\\', R'\\\\')
|
||
self.assertEqual(fR'\\', R'\\')
|
||
self.assertEqual(fR'\\\\', R'\\\\')
|
||
self.assertEqual(FR'\\', R'\\')
|
||
self.assertEqual(FR'\\\\', R'\\\\')
|
||
|
||
def test_fstring_format_spec_greedy_matching(self):
|
||
self.assertEqual(f"{1:}}}", "1}")
|
||
self.assertEqual(f"{1:>3{5}}}}", " 1}")
|
||
|
||
def test_yield(self):
|
||
# Not terribly useful, but make sure the yield turns
|
||
# a function into a generator
|
||
def fn(y):
|
||
f'y:{yield y*2}'
|
||
f'{yield}'
|
||
|
||
g = fn(4)
|
||
self.assertEqual(next(g), 8)
|
||
self.assertEqual(next(g), None)
|
||
|
||
def test_yield_send(self):
|
||
def fn(x):
|
||
yield f'x:{yield (lambda i: x * i)}'
|
||
|
||
g = fn(10)
|
||
the_lambda = next(g)
|
||
self.assertEqual(the_lambda(4), 40)
|
||
self.assertEqual(g.send('string'), 'x:string')
|
||
|
||
def test_expressions_with_triple_quoted_strings(self):
|
||
self.assertEqual(f"{'''x'''}", 'x')
|
||
self.assertEqual(f"{'''eric's'''}", "eric's")
|
||
|
||
# Test concatenation within an expression
|
||
self.assertEqual(f'{"x" """eric"s""" "y"}', 'xeric"sy')
|
||
self.assertEqual(f'{"x" """eric"s"""}', 'xeric"s')
|
||
self.assertEqual(f'{"""eric"s""" "y"}', 'eric"sy')
|
||
self.assertEqual(f'{"""x""" """eric"s""" "y"}', 'xeric"sy')
|
||
self.assertEqual(f'{"""x""" """eric"s""" """y"""}', 'xeric"sy')
|
||
self.assertEqual(f'{r"""x""" """eric"s""" """y"""}', 'xeric"sy')
|
||
|
||
def test_multiple_vars(self):
|
||
x = 98
|
||
y = 'abc'
|
||
self.assertEqual(f'{x}{y}', '98abc')
|
||
|
||
self.assertEqual(f'X{x}{y}', 'X98abc')
|
||
self.assertEqual(f'{x}X{y}', '98Xabc')
|
||
self.assertEqual(f'{x}{y}X', '98abcX')
|
||
|
||
self.assertEqual(f'X{x}Y{y}', 'X98Yabc')
|
||
self.assertEqual(f'X{x}{y}Y', 'X98abcY')
|
||
self.assertEqual(f'{x}X{y}Y', '98XabcY')
|
||
|
||
self.assertEqual(f'X{x}Y{y}Z', 'X98YabcZ')
|
||
|
||
def test_closure(self):
|
||
def outer(x):
|
||
def inner():
|
||
return f'x:{x}'
|
||
return inner
|
||
|
||
self.assertEqual(outer('987')(), 'x:987')
|
||
self.assertEqual(outer(7)(), 'x:7')
|
||
|
||
def test_arguments(self):
|
||
y = 2
|
||
def f(x, width):
|
||
return f'x={x*y:{width}}'
|
||
|
||
self.assertEqual(f('foo', 10), 'x=foofoo ')
|
||
x = 'bar'
|
||
self.assertEqual(f(10, 10), 'x= 20')
|
||
|
||
def test_locals(self):
|
||
value = 123
|
||
self.assertEqual(f'v:{value}', 'v:123')
|
||
|
||
def test_missing_variable(self):
|
||
with self.assertRaises(NameError):
|
||
f'v:{value}'
|
||
|
||
def test_missing_format_spec(self):
|
||
class O:
|
||
def __format__(self, spec):
|
||
if not spec:
|
||
return '*'
|
||
return spec
|
||
|
||
self.assertEqual(f'{O():x}', 'x')
|
||
self.assertEqual(f'{O()}', '*')
|
||
self.assertEqual(f'{O():}', '*')
|
||
|
||
self.assertEqual(f'{3:}', '3')
|
||
self.assertEqual(f'{3!s:}', '3')
|
||
|
||
def test_global(self):
|
||
self.assertEqual(f'g:{a_global}', 'g:global variable')
|
||
self.assertEqual(f'g:{a_global!r}', "g:'global variable'")
|
||
|
||
a_local = 'local variable'
|
||
self.assertEqual(f'g:{a_global} l:{a_local}',
|
||
'g:global variable l:local variable')
|
||
self.assertEqual(f'g:{a_global!r}',
|
||
"g:'global variable'")
|
||
self.assertEqual(f'g:{a_global} l:{a_local!r}',
|
||
"g:global variable l:'local variable'")
|
||
|
||
self.assertIn("module 'unittest' from", f'{unittest}')
|
||
|
||
def test_shadowed_global(self):
|
||
a_global = 'really a local'
|
||
self.assertEqual(f'g:{a_global}', 'g:really a local')
|
||
self.assertEqual(f'g:{a_global!r}', "g:'really a local'")
|
||
|
||
a_local = 'local variable'
|
||
self.assertEqual(f'g:{a_global} l:{a_local}',
|
||
'g:really a local l:local variable')
|
||
self.assertEqual(f'g:{a_global!r}',
|
||
"g:'really a local'")
|
||
self.assertEqual(f'g:{a_global} l:{a_local!r}',
|
||
"g:really a local l:'local variable'")
|
||
|
||
def test_call(self):
|
||
def foo(x):
|
||
return 'x=' + str(x)
|
||
|
||
self.assertEqual(f'{foo(10)}', 'x=10')
|
||
|
||
def test_nested_fstrings(self):
|
||
y = 5
|
||
self.assertEqual(f'{f"{0}"*3}', '000')
|
||
self.assertEqual(f'{f"{y}"*3}', '555')
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_invalid_string_prefixes(self):
|
||
single_quote_cases = ["fu''",
|
||
"uf''",
|
||
"Fu''",
|
||
"fU''",
|
||
"Uf''",
|
||
"uF''",
|
||
"ufr''",
|
||
"urf''",
|
||
"fur''",
|
||
"fru''",
|
||
"rfu''",
|
||
"ruf''",
|
||
"FUR''",
|
||
"Fur''",
|
||
"fb''",
|
||
"fB''",
|
||
"Fb''",
|
||
"FB''",
|
||
"bf''",
|
||
"bF''",
|
||
"Bf''",
|
||
"BF''",]
|
||
double_quote_cases = [case.replace("'", '"') for case in single_quote_cases]
|
||
self.assertAllRaise(SyntaxError, 'prefixes are incompatible',
|
||
single_quote_cases + double_quote_cases)
|
||
|
||
def test_leading_trailing_spaces(self):
|
||
self.assertEqual(f'{ 3}', '3')
|
||
self.assertEqual(f'{ 3}', '3')
|
||
self.assertEqual(f'{3 }', '3')
|
||
self.assertEqual(f'{3 }', '3')
|
||
|
||
self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]}}',
|
||
'expr={1: 2}')
|
||
self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]} }',
|
||
'expr={1: 2}')
|
||
|
||
def test_not_equal(self):
|
||
# There's a special test for this because there's a special
|
||
# case in the f-string parser to look for != as not ending an
|
||
# expression. Normally it would, while looking for !s or !r.
|
||
|
||
self.assertEqual(f'{3!=4}', 'True')
|
||
self.assertEqual(f'{3!=4:}', 'True')
|
||
self.assertEqual(f'{3!=4!s}', 'True')
|
||
self.assertEqual(f'{3!=4!s:.3}', 'Tru')
|
||
|
||
def test_equal_equal(self):
|
||
# Because an expression ending in = has special meaning,
|
||
# there's a special test for ==. Make sure it works.
|
||
|
||
self.assertEqual(f'{0==1}', 'False')
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_conversions(self):
|
||
self.assertEqual(f'{3.14:10.10}', ' 3.14')
|
||
self.assertEqual(f'{1.25!s:10.10}', '1.25 ')
|
||
self.assertEqual(f'{1.25!r:10.10}', '1.25 ')
|
||
self.assertEqual(f'{1.25!a:10.10}', '1.25 ')
|
||
|
||
self.assertEqual(f'{"a"}', 'a')
|
||
self.assertEqual(f'{"a"!r}', "'a'")
|
||
self.assertEqual(f'{"a"!a}', "'a'")
|
||
|
||
# Conversions can have trailing whitespace after them since it
|
||
# does not provide any significance
|
||
self.assertEqual(f"{3!s }", "3")
|
||
self.assertEqual(f'{1.25!s :10.10}', '1.25 ')
|
||
|
||
# Not a conversion.
|
||
self.assertEqual(f'{"a!r"}', "a!r")
|
||
|
||
# Not a conversion, but show that ! is allowed in a format spec.
|
||
self.assertEqual(f'{3.14:!<10.10}', '3.14!!!!!!')
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||
["f'{3!'",
|
||
"f'{3!s'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, 'f-string: missing conversion character',
|
||
["f'{3!}'",
|
||
"f'{3!:'",
|
||
"f'{3!:}'",
|
||
])
|
||
|
||
for conv_identifier in 'g', 'A', 'G', 'ä', 'ɐ':
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: invalid conversion character %r: "
|
||
"expected 's', 'r', or 'a'" % conv_identifier,
|
||
["f'{3!" + conv_identifier + "}'"])
|
||
|
||
for conv_non_identifier in '3', '!':
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: invalid conversion character",
|
||
["f'{3!" + conv_non_identifier + "}'"])
|
||
|
||
for conv in ' s', ' s ':
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: conversion type must come right after the"
|
||
" exclamation mark",
|
||
["f'{3!" + conv + "}'"])
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: invalid conversion character 'ss': "
|
||
"expected 's', 'r', or 'a'",
|
||
["f'{3!ss}'",
|
||
"f'{3!ss:}'",
|
||
"f'{3!ss:s}'",
|
||
])
|
||
|
||
def test_assignment(self):
|
||
self.assertAllRaise(SyntaxError, r'invalid syntax',
|
||
["f'' = 3",
|
||
"f'{0}' = x",
|
||
"f'{x}' = x",
|
||
])
|
||
|
||
def test_del(self):
|
||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||
["del f''",
|
||
"del '' f''",
|
||
])
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_mismatched_braces(self):
|
||
self.assertAllRaise(SyntaxError, "f-string: single '}' is not allowed",
|
||
["f'{{}'",
|
||
"f'{{}}}'",
|
||
"f'}'",
|
||
"f'x}'",
|
||
"f'x}x'",
|
||
r"f'\u007b}'",
|
||
|
||
# Can't have { or } in a format spec.
|
||
"f'{3:}>10}'",
|
||
"f'{3:}}>10}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||
["f'{3'",
|
||
"f'{3!'",
|
||
"f'{3:'",
|
||
"f'{3!s'",
|
||
"f'{3!s:'",
|
||
"f'{3!s:3'",
|
||
"f'x{'",
|
||
"f'x{x'",
|
||
"f'{x'",
|
||
"f'{3:s'",
|
||
"f'{{{'",
|
||
"f'{{}}{'",
|
||
"f'{'",
|
||
"f'{i='", # See gh-93418.
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError,
|
||
"f-string: expecting a valid expression after '{'",
|
||
["f'{3:{{>10}'",
|
||
])
|
||
|
||
# But these are just normal strings.
|
||
self.assertEqual(f'{"{"}', '{')
|
||
self.assertEqual(f'{"}"}', '}')
|
||
self.assertEqual(f'{3:{"}"}>10}', '}}}}}}}}}3')
|
||
self.assertEqual(f'{2:{"{"}>10}', '{{{{{{{{{2')
|
||
|
||
def test_if_conditional(self):
|
||
# There's special logic in compile.c to test if the
|
||
# conditional for an if (and while) are constants. Exercise
|
||
# that code.
|
||
|
||
def test_fstring(x, expected):
|
||
flag = 0
|
||
if f'{x}':
|
||
flag = 1
|
||
else:
|
||
flag = 2
|
||
self.assertEqual(flag, expected)
|
||
|
||
def test_concat_empty(x, expected):
|
||
flag = 0
|
||
if '' f'{x}':
|
||
flag = 1
|
||
else:
|
||
flag = 2
|
||
self.assertEqual(flag, expected)
|
||
|
||
def test_concat_non_empty(x, expected):
|
||
flag = 0
|
||
if ' ' f'{x}':
|
||
flag = 1
|
||
else:
|
||
flag = 2
|
||
self.assertEqual(flag, expected)
|
||
|
||
test_fstring('', 2)
|
||
test_fstring(' ', 1)
|
||
|
||
test_concat_empty('', 2)
|
||
test_concat_empty(' ', 1)
|
||
|
||
test_concat_non_empty('', 1)
|
||
test_concat_non_empty(' ', 1)
|
||
|
||
def test_empty_format_specifier(self):
|
||
x = 'test'
|
||
self.assertEqual(f'{x}', 'test')
|
||
self.assertEqual(f'{x:}', 'test')
|
||
self.assertEqual(f'{x!s:}', 'test')
|
||
self.assertEqual(f'{x!r:}', "'test'")
|
||
|
||
def test_str_format_differences(self):
|
||
d = {'a': 'string',
|
||
0: 'integer',
|
||
}
|
||
a = 0
|
||
self.assertEqual(f'{d[0]}', 'integer')
|
||
self.assertEqual(f'{d["a"]}', 'string')
|
||
self.assertEqual(f'{d[a]}', 'integer')
|
||
self.assertEqual('{d[a]}'.format(d=d), 'string')
|
||
self.assertEqual('{d[0]}'.format(d=d), 'integer')
|
||
|
||
def test_errors(self):
|
||
# see issue 26287
|
||
self.assertAllRaise(TypeError, 'unsupported',
|
||
[r"f'{(lambda: 0):x}'",
|
||
r"f'{(0,):x}'",
|
||
])
|
||
self.assertAllRaise(ValueError, 'Unknown format code',
|
||
[r"f'{1000:j}'",
|
||
r"f'{1000:j}'",
|
||
])
|
||
|
||
def test_filename_in_syntaxerror(self):
|
||
# see issue 38964
|
||
with temp_cwd() as cwd:
|
||
file_path = os.path.join(cwd, 't.py')
|
||
with open(file_path, 'w', encoding="utf-8") as f:
|
||
f.write('f"{a b}"') # This generates a SyntaxError
|
||
_, _, stderr = assert_python_failure(file_path,
|
||
PYTHONIOENCODING='ascii')
|
||
self.assertIn(file_path.encode('ascii', 'backslashreplace'), stderr)
|
||
|
||
def test_loop(self):
|
||
for i in range(1000):
|
||
self.assertEqual(f'i:{i}', 'i:' + str(i))
|
||
|
||
def test_dict(self):
|
||
d = {'"': 'dquote',
|
||
"'": 'squote',
|
||
'foo': 'bar',
|
||
}
|
||
self.assertEqual(f'''{d["'"]}''', 'squote')
|
||
self.assertEqual(f"""{d['"']}""", 'dquote')
|
||
|
||
self.assertEqual(f'{d["foo"]}', 'bar')
|
||
self.assertEqual(f"{d['foo']}", 'bar')
|
||
|
||
def test_backslash_char(self):
|
||
# Check eval of a backslash followed by a control char.
|
||
# See bpo-30682: this used to raise an assert in pydebug mode.
|
||
self.assertEqual(eval('f"\\\n"'), '')
|
||
self.assertEqual(eval('f"\\\r"'), '')
|
||
|
||
def test_debug_conversion(self):
|
||
x = 'A string'
|
||
self.assertEqual(f'{x=}', 'x=' + repr(x))
|
||
self.assertEqual(f'{x =}', 'x =' + repr(x))
|
||
self.assertEqual(f'{x=!s}', 'x=' + str(x))
|
||
self.assertEqual(f'{x=!r}', 'x=' + repr(x))
|
||
self.assertEqual(f'{x=!a}', 'x=' + ascii(x))
|
||
|
||
x = 2.71828
|
||
self.assertEqual(f'{x=:.2f}', 'x=' + format(x, '.2f'))
|
||
self.assertEqual(f'{x=:}', 'x=' + format(x, ''))
|
||
self.assertEqual(f'{x=!r:^20}', 'x=' + format(repr(x), '^20'))
|
||
self.assertEqual(f'{x=!s:^20}', 'x=' + format(str(x), '^20'))
|
||
self.assertEqual(f'{x=!a:^20}', 'x=' + format(ascii(x), '^20'))
|
||
|
||
x = 9
|
||
self.assertEqual(f'{3*x+15=}', '3*x+15=42')
|
||
|
||
# There is code in ast.c that deals with non-ascii expression values. So,
|
||
# use a unicode identifier to trigger that.
|
||
tenπ = 31.4
|
||
self.assertEqual(f'{tenπ=:.2f}', 'tenπ=31.40')
|
||
|
||
# Also test with Unicode in non-identifiers.
|
||
self.assertEqual(f'{"Σ"=}', '"Σ"=\'Σ\'')
|
||
|
||
# Make sure nested fstrings still work.
|
||
self.assertEqual(f'{f"{3.1415=:.1f}":*^20}', '*****3.1415=3.1*****')
|
||
|
||
# Make sure text before and after an expression with = works
|
||
# correctly.
|
||
pi = 'π'
|
||
self.assertEqual(f'alpha α {pi=} ω omega', "alpha α pi='π' ω omega")
|
||
|
||
# Check multi-line expressions.
|
||
self.assertEqual(f'''{
|
||
3
|
||
=}''', '\n3\n=3')
|
||
|
||
# Since = is handled specially, make sure all existing uses of
|
||
# it still work.
|
||
|
||
self.assertEqual(f'{0==1}', 'False')
|
||
self.assertEqual(f'{0!=1}', 'True')
|
||
self.assertEqual(f'{0<=1}', 'True')
|
||
self.assertEqual(f'{0>=1}', 'False')
|
||
self.assertEqual(f'{(x:="5")}', '5')
|
||
self.assertEqual(x, '5')
|
||
self.assertEqual(f'{(x:=5)}', '5')
|
||
self.assertEqual(x, 5)
|
||
self.assertEqual(f'{"="}', '=')
|
||
|
||
x = 20
|
||
# This isn't an assignment expression, it's 'x', with a format
|
||
# spec of '=10'. See test_walrus: you need to use parens.
|
||
self.assertEqual(f'{x:=10}', ' 20')
|
||
|
||
# Test named function parameters, to make sure '=' parsing works
|
||
# there.
|
||
def f(a):
|
||
nonlocal x
|
||
oldx = x
|
||
x = a
|
||
return oldx
|
||
x = 0
|
||
self.assertEqual(f'{f(a="3=")}', '0')
|
||
self.assertEqual(x, '3=')
|
||
self.assertEqual(f'{f(a=4)}', '3=')
|
||
self.assertEqual(x, 4)
|
||
|
||
# Check debug expressions in format spec
|
||
y = 20
|
||
self.assertEqual(f"{2:{y=}}", "yyyyyyyyyyyyyyyyyyy2")
|
||
self.assertEqual(f"{datetime.datetime.now():h1{y=}h2{y=}h3{y=}}",
|
||
'h1y=20h2y=20h3y=20')
|
||
|
||
# Make sure __format__ is being called.
|
||
class C:
|
||
def __format__(self, s):
|
||
return f'FORMAT-{s}'
|
||
def __repr__(self):
|
||
return 'REPR'
|
||
|
||
self.assertEqual(f'{C()=}', 'C()=REPR')
|
||
self.assertEqual(f'{C()=!r}', 'C()=REPR')
|
||
self.assertEqual(f'{C()=:}', 'C()=FORMAT-')
|
||
self.assertEqual(f'{C()=: }', 'C()=FORMAT- ')
|
||
self.assertEqual(f'{C()=:x}', 'C()=FORMAT-x')
|
||
self.assertEqual(f'{C()=!r:*^20}', 'C()=********REPR********')
|
||
self.assertEqual(f"{C():{20=}}", 'FORMAT-20=20')
|
||
|
||
self.assertRaises(SyntaxError, eval, "f'{C=]'")
|
||
|
||
|
||
# Make sure leading and following text works.
|
||
x = 'foo'
|
||
self.assertEqual(f'X{x=}Y', 'Xx='+repr(x)+'Y')
|
||
|
||
# Make sure whitespace around the = works.
|
||
self.assertEqual(f'X{x =}Y', 'Xx ='+repr(x)+'Y')
|
||
self.assertEqual(f'X{x= }Y', 'Xx= '+repr(x)+'Y')
|
||
self.assertEqual(f'X{x = }Y', 'Xx = '+repr(x)+'Y')
|
||
self.assertEqual(f"sadsd {1 + 1 = :{1 + 1:1d}f}", "sadsd 1 + 1 = 2.000000")
|
||
|
||
self.assertEqual(f"{1+2 = # my comment
|
||
}", '1+2 = \n 3')
|
||
|
||
self.assertEqual(f'{""" # booo
|
||
"""=}', '""" # booo\n """=\' # booo\\n \'')
|
||
|
||
self.assertEqual(f'{" # nooo "=}', '" # nooo "=\' # nooo \'')
|
||
self.assertEqual(f'{" \" # nooo \" "=}', '" \\" # nooo \\" "=\' " # nooo " \'')
|
||
|
||
self.assertEqual(f'{ # some comment goes here
|
||
"""hello"""=}', ' \n """hello"""=\'hello\'')
|
||
self.assertEqual(f'{"""# this is not a comment
|
||
a""" # this is a comment
|
||
}', '# this is not a comment\n a')
|
||
|
||
# These next lines contains tabs. Backslash escapes don't
|
||
# work in f-strings.
|
||
# patchcheck doesn't like these tabs. So the only way to test
|
||
# this will be to dynamically created and exec the f-strings. But
|
||
# that's such a hassle I'll save it for another day. For now, convert
|
||
# the tabs to spaces just to shut up patchcheck.
|
||
#self.assertEqual(f'X{x =}Y', 'Xx\t='+repr(x)+'Y')
|
||
#self.assertEqual(f'X{x = }Y', 'Xx\t=\t'+repr(x)+'Y')
|
||
|
||
def test_debug_expressions_are_raw_strings(self):
|
||
with warnings.catch_warnings():
|
||
warnings.simplefilter('ignore', SyntaxWarning)
|
||
self.assertEqual(eval("""f'{b"\\N{OX}"=}'"""), 'b"\\N{OX}"=b\'\\\\N{OX}\'')
|
||
self.assertEqual(f'{r"\xff"=}', 'r"\\xff"=\'\\\\xff\'')
|
||
self.assertEqual(f'{r"\n"=}', 'r"\\n"=\'\\\\n\'')
|
||
self.assertEqual(f"{'\''=}", "'\\''=\"'\"")
|
||
self.assertEqual(f'{'\xc5'=}', r"'\xc5'='Å'")
|
||
|
||
def test_walrus(self):
|
||
x = 20
|
||
# This isn't an assignment expression, it's 'x', with a format
|
||
# spec of '=10'.
|
||
self.assertEqual(f'{x:=10}', ' 20')
|
||
|
||
# This is an assignment expression, which requires parens.
|
||
self.assertEqual(f'{(x:=10)}', '10')
|
||
self.assertEqual(x, 10)
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: "f-string: expecting '=', or '!', or ':', or '}'" does not match "invalid syntax (?, line 1)"
|
||
def test_invalid_syntax_error_message(self):
|
||
with self.assertRaisesRegex(SyntaxError,
|
||
"f-string: expecting '=', or '!', or ':', or '}'"):
|
||
compile("f'{a $ b}'", "?", "exec")
|
||
|
||
def test_with_two_commas_in_format_specifier(self):
|
||
error_msg = re.escape("Cannot specify ',' with ','.")
|
||
with self.assertRaisesRegex(ValueError, error_msg):
|
||
f'{1:,,}'
|
||
|
||
def test_with_two_underscore_in_format_specifier(self):
|
||
error_msg = re.escape("Cannot specify '_' with '_'.")
|
||
with self.assertRaisesRegex(ValueError, error_msg):
|
||
f'{1:__}'
|
||
|
||
def test_with_a_commas_and_an_underscore_in_format_specifier(self):
|
||
error_msg = re.escape("Cannot specify both ',' and '_'.")
|
||
with self.assertRaisesRegex(ValueError, error_msg):
|
||
f'{1:,_}'
|
||
|
||
def test_with_an_underscore_and_a_comma_in_format_specifier(self):
|
||
error_msg = re.escape("Cannot specify both ',' and '_'.")
|
||
with self.assertRaisesRegex(ValueError, error_msg):
|
||
f'{1:_,}'
|
||
|
||
def test_syntax_error_for_starred_expressions(self):
|
||
with self.assertRaisesRegex(SyntaxError, "can't use starred expression here"):
|
||
compile("f'{*a}'", "?", "exec")
|
||
|
||
with self.assertRaisesRegex(SyntaxError,
|
||
"f-string: expecting a valid expression after '{'"):
|
||
compile("f'{**a}'", "?", "exec")
|
||
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON; -
|
||
def test_not_closing_quotes(self):
|
||
self.assertAllRaise(SyntaxError, "unterminated f-string literal", ['f"', "f'"])
|
||
self.assertAllRaise(SyntaxError, "unterminated triple-quoted f-string literal",
|
||
['f"""', "f'''"])
|
||
# Ensure that the errors are reported at the correct line number.
|
||
data = '''\
|
||
x = 1 + 1
|
||
y = 2 + 2
|
||
z = f"""
|
||
sdfjnsdfjsdf
|
||
sdfsdfs{1+
|
||
2} dfigdf {3+
|
||
4}sdufsd""
|
||
'''
|
||
try:
|
||
compile(data, "?", "exec")
|
||
except SyntaxError as e:
|
||
self.assertEqual(e.text, 'z = f"""')
|
||
self.assertEqual(e.lineno, 3)
|
||
@unittest.expectedFailure # TODO: RUSTPYTHON
|
||
def test_syntax_error_after_debug(self):
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting a valid expression after '{'",
|
||
[
|
||
"f'{1=}{;'",
|
||
"f'{1=}{+;'",
|
||
"f'{1=}{2}{;'",
|
||
"f'{1=}{3}{;'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '=', or '!', or ':', or '}'",
|
||
[
|
||
"f'{1=}{1;'",
|
||
"f'{1=}{1;}'",
|
||
])
|
||
|
||
def test_debug_in_file(self):
|
||
with temp_cwd():
|
||
script = 'script.py'
|
||
with open('script.py', 'w') as f:
|
||
f.write(f"""\
|
||
print(f'''{{
|
||
3
|
||
=}}''')""")
|
||
|
||
_, stdout, _ = assert_python_ok(script)
|
||
self.assertEqual(stdout.decode('utf-8').strip().replace('\r\n', '\n').replace('\r', '\n'),
|
||
"3\n=3")
|
||
|
||
def test_syntax_warning_infinite_recursion_in_file(self):
|
||
with temp_cwd():
|
||
script = 'script.py'
|
||
with open(script, 'w') as f:
|
||
f.write(r"print(f'\{1}')")
|
||
|
||
_, stdout, stderr = assert_python_ok(script)
|
||
self.assertIn(rb'\1', stdout)
|
||
self.assertEqual(len(stderr.strip().splitlines()), 2)
|
||
|
||
def test_fstring_without_formatting_bytecode(self):
|
||
# f-string without any formatting should emit the same bytecode
|
||
# as a normal string. See gh-99606.
|
||
def get_code(s):
|
||
return [(i.opname, i.oparg) for i in dis.get_instructions(s)]
|
||
|
||
for s in ["", "some string"]:
|
||
self.assertEqual(get_code(f"'{s}'"), get_code(f"f'{s}'"))
|
||
|
||
def test_gh129093(self):
|
||
self.assertEqual(f'{1==2=}', '1==2=False')
|
||
self.assertEqual(f'{1 == 2=}', '1 == 2=False')
|
||
self.assertEqual(f'{1!=2=}', '1!=2=True')
|
||
self.assertEqual(f'{1 != 2=}', '1 != 2=True')
|
||
|
||
self.assertEqual(f'{(1) != 2=}', '(1) != 2=True')
|
||
self.assertEqual(f'{(1*2) != (3)=}', '(1*2) != (3)=True')
|
||
|
||
self.assertEqual(f'{1 != 2 == 3 != 4=}', '1 != 2 == 3 != 4=False')
|
||
self.assertEqual(f'{1 == 2 != 3 == 4=}', '1 == 2 != 3 == 4=False')
|
||
|
||
self.assertEqual(f'{f'{1==2=}'=}', "f'{1==2=}'='1==2=False'")
|
||
self.assertEqual(f'{f'{1 == 2=}'=}', "f'{1 == 2=}'='1 == 2=False'")
|
||
self.assertEqual(f'{f'{1!=2=}'=}', "f'{1!=2=}'='1!=2=True'")
|
||
self.assertEqual(f'{f'{1 != 2=}'=}', "f'{1 != 2=}'='1 != 2=True'")
|
||
|
||
def test_newlines_in_format_specifiers(self):
|
||
cases = [
|
||
"""f'{1:d\n}'""",
|
||
"""f'__{
|
||
1:d
|
||
}__'""",
|
||
'''f"{value:.
|
||
{'2f'}}"''',
|
||
'''f"{value:
|
||
{'.2f'}f}"''',
|
||
'''f"{value:
|
||
#{'x'}}"''',
|
||
]
|
||
self.assertAllRaise(SyntaxError, "f-string: newlines are not allowed in format specifiers", cases)
|
||
|
||
valid_cases = [
|
||
"""f'''__{
|
||
1:d
|
||
}__'''""",
|
||
"""f'''{1:d\n}'''""",
|
||
]
|
||
|
||
for case in valid_cases:
|
||
compile(case, "<string>", "exec")
|
||
|
||
def test_raw_fstring_format_spec(self):
|
||
# Test raw f-string format spec behavior (Issue #137314).
|
||
#
|
||
# Raw f-strings should preserve literal backslashes in format specifications,
|
||
# not interpret them as escape sequences.
|
||
class UnchangedFormat:
|
||
"""Test helper that returns the format spec unchanged."""
|
||
def __format__(self, format):
|
||
return format
|
||
|
||
# Test basic escape sequences
|
||
self.assertEqual(f"{UnchangedFormat():\xFF}", 'ÿ')
|
||
self.assertEqual(rf"{UnchangedFormat():\xFF}", '\\xFF')
|
||
|
||
# Test nested expressions with raw/non-raw combinations
|
||
self.assertEqual(rf"{UnchangedFormat():{'\xFF'}}", 'ÿ')
|
||
self.assertEqual(f"{UnchangedFormat():{r'\xFF'}}", '\\xFF')
|
||
self.assertEqual(rf"{UnchangedFormat():{r'\xFF'}}", '\\xFF')
|
||
|
||
# Test continuation character in format specs
|
||
self.assertEqual(f"""{UnchangedFormat():{'a'\
|
||
'b'}}""", 'ab')
|
||
self.assertEqual(rf"""{UnchangedFormat():{'a'\
|
||
'b'}}""", 'ab')
|
||
|
||
# Test multiple format specs in same raw f-string
|
||
self.assertEqual(rf"{UnchangedFormat():\xFF} {UnchangedFormat():\n}", '\\xFF \\n')
|
||
|
||
def test_gh139516(self):
|
||
with temp_cwd():
|
||
script = 'script.py'
|
||
with open(script, 'wb') as f:
|
||
f.write('''def f(a): pass\nf"{f(a=lambda: 'à'\n)}"'''.encode())
|
||
assert_python_ok(script)
|
||
|
||
|
||
if __name__ == '__main__':
|
||
unittest.main()
|