class A(object):
	def __init__(self, *args, **kwargs):
		pass


class B(object):
	def __init__(self, *args, **kwargs):
		pass

	def __new__(cls, *args, **kwargs):
		return object.__new__(cls)


class C(B):
	pass


C(1, 2, 3)

C.__bases__ = (A,)

# fails in python3
C(1, 2, 3)