Is this a bug?

[Carolina Feher]

>>> def f(a):
...     return 5
...
>>> class A(list):
...     g = f
...     def __new__(cls):
...             c = list.__new__(cls, [1, 2])
...             c.g()
...             return c
...
>>> a = A()
>>> a
[]

Why is an empty list returned?