# 深度优先
# 实例d调用foo()时，搜索顺序是 D => C1 => P1
# 实例d调用bar()时，搜索顺序是 D => C1 => P1 => P2
# 广度优先
# 实例d调用foo()时，搜索顺序是 D => C1 => C2 => P1
# 实例d调用bar()时，搜索顺序是 D => C1 => C2
class P1(object):
    def foo(self):
        print 'p1-foo'

class P2 (object):
    def foo(self):
        print 'p2-foo'

    def bar(self):
        print 'p2-bar'

class C1 (P1,P2):
    pass

class C2 (P1,P2):
    def bar(self):
        print 'C2-bar'

class D(C1,C2):
    pass

d = D()
d.foo()
d.bar()