list iadd and tuple setitem

# This:
# >>> a[0] += ['hi']
#
# Is pretty much the same as this:
# >>> x = a[0]
# >>> x += ['hi']
# >>> a[0] = x


class Tuple(tuple):
    def __setitem__(self, *args, **kwargs):
        print("TUPLE __setitem__")
        return super().__setitem__(*args, **kwargs)


class List(list):
    def __iadd__(self, *args, **kwargs):
        print("LIST __iadd__")
        return super().__iadd__(*args, **kwargs)

# >>> x = List()
# >>> y = Tuple((x,))
# >>> y[0] += List([1])
# LIST __iadd__
# TUPLE __setitem__
# Traceback (most recent call last):
#   File "<stdin>", line 1, in <module>
#   File "<stdin>", line 4, in __setitem__
# AttributeError: 'super' object has no attribute '__setitem__'