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gh-120838: Add a Note in the Docs About Expectations for Py_Finalize() #120839

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Jun 21, 2024
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gh-120838: Add a Note in the Docs About Expectations for Py_Finalize() #120839

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13 changes: 10 additions & 3 deletions Doc/c-api/init.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -391,9 +391,16 @@ Initializing and finalizing the interpreter
:c:func:`Py_NewInterpreter` below) that were created and not yet destroyed since
the last call to :c:func:`Py_Initialize`. Ideally, this frees all memory
allocated by the Python interpreter. This is a no-op when called for a second
time (without calling :c:func:`Py_Initialize` again first). Normally the
return value is ``0``. If there were errors during finalization
(flushing buffered data), ``-1`` is returned.
time (without calling :c:func:`Py_Initialize` again first).

Since this is the reverse of :c:func:`Py_Initialize`, it should be called
in the same thread with the same interpreter active. That means
the main thread and the main interpreter.
This should never be called while :c:func:`Py_RunMain` is running.

Normally the return value is ``0``.
If there were errors during finalization (flushing buffered data),
``-1`` is returned.

This function is provided for a number of reasons. An embedding application
might want to restart Python without having to restart the application itself.
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