python中MRO原理的使用

class P1:
    def foo(self):
        print("p1-foo")
class P2:
    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
print(D.__mro__)
d=D()
d.foo()