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Code:
class C(object):
	def __init__(self, a, b=2, c=3):
		pass
class D(C):
	def __init__(self, d, **kwargs):
		super(D, self).__init__(**kwargs)
class E(D):
	def __init__(self, **kwargs):
		super(E, self).__init__(**kwargs)
E(d=42, b=0, c=0)
You get the funny message:
TypeError: __init__() takes at least 2 arguments (3 given)

This is a well-known shortcoming of 2.x function signature errors. The situation is much improved in 3.x:
TypeError: __init__() missing 1 required positional argument: 'a'