class a(object):
	def __new__(self):
		print "a_new"
		return object.__new__(self)

class b:
	def __init__(self):
		print "b_init"

class c(b, a):
	pass

test = c()

class c(a, b):
           pass

test=c()

>>> class c(a, b):pass
...
>>> c.__bases__
(<class '__main__.a'>, <class __main__.b at 0xb8024ddc>)
>>> a.__init__
<slot wrapper '__init__' of 'object' objects>
>>>