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PEP 7: Python 3.11 uses C99 and C11 #2309

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vstinner merged 3 commits into from
Feb 24, 2022
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PEP 7: Python 3.11 uses C99 and C11 #2309

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PEP 7: Python 3.11 uses C11
vstinner Feb 7, 2022
cd43ebe
Grammar; remove Future C99 features
vstinner Feb 24, 2022
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vstinner Feb 24, 2022
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16 changes: 8 additions & 8 deletions pep-0007.txt
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Expand Up @@ -31,13 +31,11 @@ particular rule:
C dialect
=========

* Python versions before 3.6 use ANSI/ISO standard C (the 1989 version
of the standard). This means (amongst many other things) that all
declarations must be at the top of a block (not necessarily at the
top of function).
* Python 3.11 and newer versions use C11 without `optional features
<https://en.wikipedia.org/wiki/C11_%28C_standard_revision%29#Optional_features>`_.
The public C API should be compatible with C++.

* Python versions greater than or equal to 3.6 use C89 with several
select C99 features:
* Python 3.6 to 3.10 use C89 with several select C99 features:

- Standard integer types in ``<stdint.h>`` and ``<inttypes.h>``. We
require the fixed width integer types.
Expand All @@ -47,8 +45,10 @@ C dialect
- booleans
- C++-style line comments

Future C99 features may be added to this list in the future
depending on compiler support (mostly significantly MSVC).
* Python versions before 3.6 used ANSI/ISO standard C (the 1989 version
of the standard). This meant (amongst many other things) that all
declarations must be at the top of a block (not necessarily at the
top of function).

* Don't use compiler-specific extensions, such as those of GCC or MSVC
(e.g. don't write multi-line strings without trailing backslashes).
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