* csv: handle empty fields with skipinitialspace
skipinitialspace preprocessed records by trimming both ends of every split
field. Fields containing only spaces could therefore produce an invalid
slice, while trailing spaces were removed even though CPython preserves them.
Trim only field prefixes in the csv-core path and make the remaining
all-space trimming helper return an empty slice safely.
QUOTE_NOTNULL and QUOTE_STRINGS add another distinction: an unquoted empty
field becomes None, but a quoted empty field remains an empty string. Both
forms have identical decoded bytes, so extend the existing QUOTE_NONE custom
reader into one shared path that records whether each field started quoted.
Use that metadata only for the null conversion while retaining QUOTE_NONE
escape behavior.
Unmark Test_Csv.test_read_skipinitialspace now that its standard,
QUOTE_NOTNULL, and QUOTE_STRINGS cases pass.
This keeps the existing one-item reader lifecycle and does not add the larger
strict or multiline parser state machine.
Assisted-by: Codex:gpt-5-sol
* csv: make skipinitialspace quote-aware
The csv-core preprocessing path split each raw iterator item on every
delimiter before trimming field prefixes. Delimiters inside quoted fields were
therefore treated as separators, so spaces after them could be removed before
csv-core parsed the record.
Extract the quote, escape, delimiter, and field-start transitions from
read_quote_record() into a small per-item scanner. Reuse its events in the
skipinitialspace preprocessor and discard only InitialSpace events while
copying all other source bytes unchanged.
This keeps the custom quote-mode reader and preprocessing logic aligned
without introducing persistent multiline or strict parser state. Remove the
delimiter cache that was only needed by the old split-and-join path and add a
regression for spaces following a delimiter inside a quoted field.
Assisted-by: Codex:gpt-5-sol
This directory contains all of the Python files that make up the standard
library for RustPython.
Most of these files are copied over from the CPython repository (the 3.7
branch), with slight modifications to allow them to work under RustPython. The
current goal is to complete the standard library with as few modifications as
possible. Current modifications are just temporary workarounds for bugs/missing
feature within the RustPython implementation.
The first big module we are targeting is unittest, so we can leverage the
CPython test suite.
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