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gh-149394: Document that atexit functions are not called when os.exec*() is called #149395

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gh-149394: Document that atexit functions are not called when os.exec*() is called #149395

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3 changes: 2 additions & 1 deletion Doc/library/atexit.rst
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Expand Up @@ -15,7 +15,8 @@ at interpreter termination time they will be run in the order ``C``, ``B``,

**Note:** The functions registered via this module are not called when the
program is killed by a signal not handled by Python, when a Python fatal
internal error is detected, or when :func:`os._exit` is called.
internal error is detected, or when :func:`os._exit` or :func:`os.exec\*
<os.execl>` are called.

**Note:** The effect of registering or unregistering functions from within
a cleanup function is undefined.
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