class A(object):
 
	def __init__(self):
		self.start()
		print('running')
		self.stop()
 
	def start(self):
		print('A start')
 
	def stop(self):
		print('A stop')
 
class mixin(object):
 
	def start(self):
		super(mixin, self).start()
		print('mixin start')
 
	def stop(self):
		print('mixin stop')
		super(mixin, self).stop()
 
class B(mixin, A):
 
	def start(self):
		super(B, self).start()
		print('B start')
 
	def stop(self):
		print('B stop')
		super(B, self).stop()
 
 
B()

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