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Showing content from https://mail.python.org/pipermail/python-dev/2017-November/150487.html below:

[Python-Dev] PEP 565: Show DeprecationWarning in __main__

[Python-Dev] PEP 565: Show DeprecationWarning in __main__ [Python-Dev] PEP 565: Show DeprecationWarning in __main__Serhiy Storchaka storchaka at gmail.com
Sun Nov 12 12:10:08 EST 2017 
12.11.17 11:24, Nick Coghlan пише:
> The PEP also proposes repurposing the existing FutureWarning category
> to explicitly mean "backwards compatibility warnings that should be
> shown to users of Python applications" since:
> 
> - we don't tend to use FutureWarning for its original nominal purpose
> (changes that will continue to run but will do something different)

FutureWarning currently is used for its original nominal purpose in the 
re and ElementTree modules. It even had been added in 2.7 for behavior 
that already have been changed in Python 3 or will be changed in future 
versions (emitted only with the -3 option).
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