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Fix outdated note about 'int' rounding or truncating - #102736
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mdickinson merged 1 commit intoMar 16, 2023
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furkanonder
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Mark, tests are complete, so this is ready to merge and backport. |
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Thanks @mdickinson for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.11. |
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GH-102766 is a backport of this pull request to the 3.11 branch. |
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(cherry picked from commit 405739f) Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
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GH-102767 is a backport of this pull request to the 3.10 branch. |
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(cherry picked from commit 405739f) Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
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* main: (34 commits) pythongh-102701: Fix overflow in dictobject.c (pythonGH-102750) pythonGH-78530: add support for generators in `asyncio.wait` (python#102761) Increase stack reserve size for Windows debug builds to avoid test crashes (pythonGH-102764) pythongh-102755: Add PyErr_DisplayException(exc) (python#102756) Fix outdated note about 'int' rounding or truncating (python#102736) pythongh-102192: Replace PyErr_Fetch/Restore etc by more efficient alternatives (python#102760) pythongh-99726: Improves correctness of stat results for Windows, and uses faster API when available (pythonGH-102149) pythongh-102192: remove redundant exception fields from ssl module socket (python#102466) pythongh-102192: Replace PyErr_Fetch/Restore etc by more efficient alternatives (python#102743) pythongh-102737: Un-ignore ceval.c in the CI globals check (pythongh-102745) pythonGH-102748: remove legacy support for generator based coroutines from `asyncio.iscoroutine` (python#102749) pythongh-102721: Improve coverage of `_collections_abc._CallableGenericAlias` (python#102722) pythonGH-102653: Make recipe docstring show the correct distribution (python#102742) Add comments to `{typing,_collections_abc}._type_repr` about each other (python#102752) pythongh-102594: PyErr_SetObject adds note to exception raised on normalization error (python#102675) pythongh-94440: Fix issue of ProcessPoolExecutor shutdown hanging (python#94468) pythonGH-100112: avoid using iterable coroutines in asyncio internally (python#100128) pythongh-102690: Use Edge as fallback in webbrowser instead of IE (python#102691) pythongh-102660: Fix Refleaks in import.c (python#102744) pythongh-102738: remove from cases generator the code related to register instructions (python#102739) ...
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This PR fixes an out-of-date note attached to int conversions in stdtypes.rst.
The "may round or truncate as in C" language dates from almost 30 years ago, when conversion from a Python float to a Python int involved at C level a (long) cast applied to a C double value. Prior to standard C, presumably the precise behaviour of that cast couldn't be relied upon. But since C89 standardised this behaviour and we can reasonably rely on all current C compilers adhering to that or later standards, the note is out of date. (Moreover, the current code for converting a Python 3 int to a C double is very different.)
Related discuss.python.org thread: https://discuss.python.org/t/built-in-types-int-round-or-truncate-please-elaborate/24840