[python] Is it impossible to override __init__() method of classes implemented in C?

example.py

from datetime import datetime

class Foo(datetime):
    def __init__(self):
        datetime.__init__(self, 2014, 7, 1, 0, 0, 0)

obj = Foo()

### result:
#
# Traceback (most recent call last):
#   File "hoge.py", line 7, in <module>
#     obj = Foo()
# TypeError: Required argument 'year' (pos 1) not found
#