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gh-138580: add sys.float_info.iec_60559 boolean flag #138811

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Merged
vstinner merged 15 commits into from
Mar 24, 2026
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gh-138580: add sys.float_info.iec_60559 boolean flag #138811

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cffad22
gh-138580: add sys.float_info.stdc_iec_559 boolean flag
skirpichev Sep 12, 2025
d81b486
+1
skirpichev Sep 12, 2025
f9fa06b
+ update math docs
skirpichev Sep 12, 2025
3e33100
Merge branch 'master' into annex-f-flag/138580
skirpichev Sep 12, 2025
942ac08
+ adjust test
skirpichev Sep 12, 2025
7901dbf
Merge branch 'master' into annex-f-flag/138580
skirpichev Sep 13, 2025
0a97ff7
address review: enabled -> true
skirpichev Sep 13, 2025
4e6ba85
Update Objects/floatobject.c
skirpichev Sep 14, 2025
528d335
Merge branch 'master' into annex-f-flag/138580
skirpichev Oct 29, 2025
6a94eb6
+ clarify that this flag is not C-specific
skirpichev Oct 29, 2025
424587a
Update Doc/library/math.rst
skirpichev Oct 29, 2025
5000849
Merge branch 'master' into annex-f-flag/138580
skirpichev Nov 20, 2025
a8e4a4e
stdc_iec_559 -> iec_60559
skirpichev Nov 20, 2025
9ec3948
Update What's New in Python 3.15
vstinner Mar 24, 2026
1f87666
Merge branch 'main' into annex-f-flag/138580
vstinner Mar 24, 2026
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Update Doc/library/math.rst 
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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@skirpichev @StanFromIreland
skirpichev and StanFromIreland authored Oct 29, 2025
commit 424587a4c2668859e1a16e4d800f72f0b1598791
3 changes: 2 additions & 1 deletion Doc/library/math.rst
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Expand Up @@ -874,7 +874,8 @@ Constants

The :mod:`math` module consists mostly of thin wrappers around the platform C
math library functions. Behavior in exceptional cases follows Annex F of
the C99 standard, if :attr:`sys.float_info.stdc_iec_559` is true. The current implementation will raise
the C99 standard, if :attr:`sys.float_info.stdc_iec_559` is true.
The current implementation will raise
:exc:`ValueError` for invalid operations like ``sqrt(-1.0)`` or ``log(0.0)``
(where C99 Annex F recommends signaling invalid operation or divide-by-zero),
and :exc:`OverflowError` for results that overflow (for example,
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