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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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+ clarify that this flag is not C-specific
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@skirpichev
skirpichev committed Oct 29, 2025
commit 6a94eb6a23f1849d685c3d38e7f5ff27b6b59248
9 changes: 3 additions & 6 deletions Doc/library/sys.rst
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Expand Up @@ -773,12 +773,9 @@ always available. Unless explicitly noted otherwise, all variables are read-only

* - .. attribute:: float_info.stdc_iec_559
- :c:macro:`!__STDC_IEC_559__`
- A boolean, indicating support the IEC 60559 floating-point
standard (the Annex F of C99). If true, the
:class:`float` type characteristics matches the IEC
60559 double format and exceptional cases for
the :mod:`math` functions follow to the section F.10
of the C99 standard.
- A boolean, indicating support the IEC 60559 floating-point standard.
If true, the :class:`float` type characteristics and behavior matches
the IEC 60559 double format.

The attribute :attr:`sys.float_info.dig` needs further explanation. If
``s`` is any string representing a decimal number with at most
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