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This behavior seems to be very strange. 
>>> l = [1, 2, 3]
>>> t = ('a', l)
>>> t
('a', [1, 2, 3])
>>> t[1] += [4]
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> t
('a', [1, 2, 3, 4])