[issue33879] Item assignment in tuple mutates list despite throwing error

[njayinthehouse]

New submission from njayinthehouse <nitinjohnraj at 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 <report at bugs.python.org>
<https://bugs.python.org/issue33879>
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