Fix outdated note about 'int' rounding or truncating #102736
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furkanonder
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Mar 16, 2023
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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. |
miss-islington
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(cherry picked from commit 405739f) Co-authored-by: Mark Dickinson <[email protected]>
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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 <[email protected]>
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… (#102766) Fix outdated note about 'int' rounding or truncating (GH-102736) (cherry picked from commit 405739f) Co-authored-by: Mark Dickinson <[email protected]>
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… (#102767) Fix outdated note about 'int' rounding or truncating (GH-102736) (cherry picked from commit 405739f) Co-authored-by: Mark Dickinson <[email protected]>
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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builds to avoid test crashes (pythonGH-102764) pythongh-102755: Add PyErr_DisplayException(exc) (python#102756) Fix outdated note about 'int' rounding or truncating (python#102736) pythongh-102192: Replace PyErr_Fetch/Restore etc by more efficient alternatives (python#102760)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
intconversions instdtypes.rst.The "may round or truncate as in C" language dates from almost 30 years ago, when conversion from a Python
floatto a Pythonintinvolved at C level a(long)cast applied to a Cdoublevalue. 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 3intto 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