test_import from CPython 3.11.2

Lib/test/double_const.py

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+from test.support import TestFailed
+
+# A test for SF bug 422177:  manifest float constants varied way too much in
+# precision depending on whether Python was loading a module for the first
+# time, or reloading it from a precompiled .pyc.  The "expected" failure
+# mode is that when test_import imports this after all .pyc files have been
+# erased, it passes, but when test_import imports this from
+# double_const.pyc, it fails.  This indicates a woeful loss of precision in
+# the marshal format for doubles.  It's also possible that repr() doesn't
+# produce enough digits to get reasonable precision for this box.
+
+PI    = 3.14159265358979324
+TWOPI = 6.28318530717958648
+
+PI_str    = "3.14159265358979324"
+TWOPI_str = "6.28318530717958648"
+
+# Verify that the double x is within a few bits of eval(x_str).
+def check_ok(x, x_str):
+    assert x > 0.0
+    x2 = eval(x_str)
+    assert x2 > 0.0
+    diff = abs(x - x2)
+    # If diff is no larger than 3 ULP (wrt x2), then diff/8 is no larger
+    # than 0.375 ULP, so adding diff/8 to x2 should have no effect.
+    if x2 + (diff / 8.) != x2:
+        raise TestFailed("Manifest const %s lost too much precision " % x_str)
+
+check_ok(PI, PI_str)
+check_ok(TWOPI, TWOPI_str)

Lib/test/relimport.py

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+from .test_import import *

Lib/test/test_import/__main__.py

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+import unittest
+
+unittest.main('test.test_import')

Lib/test/test_import/data/circular_imports/basic.py

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+"""Circular imports through direct, relative imports."""
+from . import basic2

Lib/test/test_import/data/circular_imports/basic2.py

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+from . import basic

Lib/test/test_import/data/circular_imports/binding.py

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+import test.test_import.data.circular_imports.binding2 as binding2

Lib/test/test_import/data/circular_imports/binding2.py

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+import test.test_import.data.circular_imports.binding as binding

Lib/test/test_import/data/circular_imports/from_cycle1.py

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+from .from_cycle2 import a
+b = 1

Lib/test/test_import/data/circular_imports/from_cycle2.py

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+from .from_cycle1 import b
+a = 1

Lib/test/test_import/data/circular_imports/indirect.py

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+from . import basic, basic2

Lib/test/test_import/data/circular_imports/rebinding.py

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+"""Test the binding of names when a circular import shares the same name as an
+attribute."""
+from .rebinding2 import util

Lib/test/test_import/data/circular_imports/rebinding2.py

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+from .subpkg import util
+from . import rebinding
+util = util.util

Lib/test/test_import/data/circular_imports/source.py

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+from . import use
+spam = 1

Lib/test/test_import/data/circular_imports/subpackage.py

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+"""Circular import involving a sub-package."""
+from .subpkg import subpackage2

Lib/test/test_import/data/circular_imports/subpkg/subpackage2.py

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+#from .util import util
+from .. import subpackage

Lib/test/test_import/data/circular_imports/subpkg/util.py

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+def util():
+    pass

Lib/test/test_import/data/circular_imports/subpkg2/parent/__init__.py

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+import test.test_import.data.circular_imports.subpkg2.parent.child

Lib/test/test_import/data/circular_imports/subpkg2/parent/child.py

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+import test.test_import.data.circular_imports.subpkg2.parent
+
+test.test_import.data.circular_imports.subpkg2.parent

Lib/test/test_import/data/circular_imports/use.py

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+from . import source
+source.spam

Lib/test/test_import/data/circular_imports/util.py

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+def util():
+    pass

Lib/test/test_import/data/package/__init__.py

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+import package.submodule
+package.submodule

Lib/test/test_import/data/package2/submodule1.py

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+import sys
+sys.modules.pop(__package__, None)
+from . import submodule2

Lib/test/test_import/data/unwritable/__init__.py

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+import sys
+
+class MyMod(object):
+    __slots__ = ['__builtins__', '__cached__', '__doc__',
+                 '__file__', '__loader__', '__name__',
+                 '__package__', '__path__', '__spec__']
+    def __init__(self):
+        for attr in self.__slots__:
+            setattr(self, attr, globals()[attr])
+
+
+sys.modules[__name__] = MyMod()