[issue24346] Key Error at List in Tuple concatenation

[stf]

New submission from stf:

>>> a = ([1,2],)
>>> a[0] += [3]

this raises an Type Error but adds the Elements to a.
So a is ([1, 2, 3],) afterwards.

This Problem doesn't occur, when you use a[0].append(3)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24346>
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