New submission from njayinthehouse <nitinjohn...@gmail.com>:
Seems like a bug.
>>> a = (1, [1])
>>> a[1] += [2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> a
(1, [1, 2])
----------
messages: 319748
nosy: njayinthehouse
priority: normal
severity: normal
status: open
title: Item assignment in tuple mutates list despite throwing error
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33879>
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