[issue40450] a=[1,2,3] a=a.extend([4]) after running these two lines of code a is None，but it show be [1,2,3,4]

[wei gu]

Change by wei gu <guwei0802 at gmail.com>:


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components: +Interpreter Core
resolution:  -> wont fix
title: wrong -> a=[1,2,3] a=a.extend([4]) after running these two lines of code a is None，but it show be [1,2,3,4]
type:  -> behavior
versions: +Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9
Added file: https://bugs.python.org/file49102/error.png

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40450>
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