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[3.9] bpo-1294959: Try to clarify the meaning of platlibdir (GH-20332) #20497

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May 28, 2020
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[3.9] bpo-1294959: Try to clarify the meaning of platlibdir (GH-20332) #20497

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7 changes: 4 additions & 3 deletions Doc/library/sys.rst
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Expand Up @@ -1141,8 +1141,7 @@ always available.
.. data:: platlibdir

Name of the platform-specific library directory. It is used to build the
path of platform-specific dynamic libraries and the path of the standard
library.
path of standard library and the paths of installed extension modules.

It is equal to ``"lib"`` on most platforms. On Fedora and SuSE, it is equal
to ``"lib64"`` on 64-bit platforms which gives the following ``sys.path``
Expand All @@ -1153,8 +1152,10 @@ always available.
* ``/usr/lib64/pythonX.Y/lib-dynload/``:
C extension modules of the standard library (like the :mod:`errno` module,
the exact filename is platform specific)
* ``/usr/lib/pythonX.Y/site-packages`` (always use ``lib``, not
* ``/usr/lib/pythonX.Y/site-packages/`` (always use ``lib``, not
:data:`sys.platlibdir`): Third-party modules
* ``/usr/lib64/pythonX.Y/site-packages/``:
C extension modules of third-party packages

.. versionadded:: 3.9

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7 changes: 3 additions & 4 deletions Doc/whatsnew/3.9.rst
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Expand Up @@ -552,10 +552,9 @@ sys
---

Add a new :attr:`sys.platlibdir` attribute: name of the platform-specific
library directory. It is used to build the path of platform-specific dynamic
libraries and the path of the standard library. It is equal to ``"lib"`` on
most platforms. On Fedora and SuSE, it is equal to ``"lib64"`` on 64-bit
platforms.
library directory. It is used to build the path of standard library and the
paths of installed extension modules. It is equal to ``"lib"`` on most
platforms. On Fedora and SuSE, it is equal to ``"lib64"`` on 64-bit platforms.
(Contributed by Jan Matějek, Matěj Cepl, Charalampos Stratakis and Victor Stinner in :issue:`1294959`.)

Previously, :attr:`sys.stderr` was block-buffered when non-interactive. Now
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2 changes: 1 addition & 1 deletion Misc/NEWS.d/3.9.0a5.rst
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Expand Up @@ -990,7 +990,7 @@ modules are built.
Add ``--with-platlibdir`` option to the configure script: name of the
platform-specific library directory, stored in the new
:attr:`sys.platlibdir` attribute. It is used to build the path of
platform-specific dynamic libraries and the path of the standard library. It
platform-specific extension modules and the path of the standard library. It
is equal to ``"lib"`` on most platforms. On Fedora and SuSE, it is equal to
``"lib64"`` on 64-bit platforms. Patch by Jan Matějek, Matěj Cepl,
Charalampos Stratakis and Victor Stinner.
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