test.py

class A():
	
	def __new__(cls,i):
		class C(cls,B):
			pass
		print C
		self = C()
		print self
		return self
	
	def foo(self):
		print 'foo'

class B():
	def bar(self):
		print 'bar'
		
a = A()
a.foo()
a.bar()