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Commit64d8b4c

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gh-112826: Add a "What's New" Entry About _thread._is_main_interpreter (gh-112853)
As ofgh-112661, the threading module expects the _thread module to have a _is_main_interpreter(), which is used in the internal threading._shutdown(). This change causes a problem for anyone that replaces the _thread module with a custom one (only if they don't provide _is_main_interpreter()). They need to be sure to add it for 3.13+, thus this PR is adding a note in "What's New".This also forward-ports the "What's New" entry from 3.12 (gh-112850). Note that we do not also forward-port the fix in that PR. The fix is there only due to a regression from 3.12.0. There is no regression in 3.13+.
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‎Doc/whatsnew/3.12.rst

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* Mixing tabs and spaces as indentation in the same file is not supported anymore and will
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raise a:exc:`TabError`.
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* The:mod:`threading` module now expects the:mod:`!_thread` module to have
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an ``_is_main_interpreter`` attribute. It is a function with no
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arguments that returns ``True`` if the current interpreter is the
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main interpreter.
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Any library or application that provides a custom ``_thread`` module
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should provide ``_is_main_interpreter()``.
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(See:gh:`112826`.)
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Build Changes
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=============
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‎Doc/whatsnew/3.13.rst

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retrieve a username, instead of:exc:`ImportError` on non-Unix platforms or
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:exc:`KeyError` on Unix platforms where the password database is empty.
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* The:mod:`threading` module now expects the:mod:`!_thread` module to have
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an ``_is_main_interpreter`` attribute. It is a function with no
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arguments that returns ``True`` if the current interpreter is the
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main interpreter.
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Any library or application that provides a custom ``_thread`` module
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must provide ``_is_main_interpreter()``, just like the module's
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other "private" attributes.
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(See:gh:`112826`.)
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Build Changes
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=============

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