python 继承2个父类

#!/usr/bin/env python
class father(object):
 def __init__(self,tail,heav):
 self.tail=tail
 self.heav=heav
class mother(object):
 def __init__(self,like,eat):
 self.like=like
 self.eat=eat
#class xiaoming(mother):
# pass
class xiaoming(father,mother):
 def __init__(self,father_tail,father_heav,mother_like,mother_eat):
 father.__init__(self,father_tail,father_heav)
 mother.__init__(self,mother_like,mother_eat)
xm=xiaoming('father_178','father_75','mother_like','mother_eat')
print "this is father self:",xm.tail,xm.heav
print "this is mother self:",xm.like,xm.eat