D.__mro__来查看MRO顺序class A():
def who_am_i(self):
print("I am A")
class B(A):
pass
class C(A):
def who_am_i(self):
print("I am C")
class D(B, C):
pass
if __name__ == '__main__':
d = D()
d.who_am_i() # I am C
print(D.__mro__)
# (<class '__main__.D'>, < class '__main__.B' >, < class '__main__.C' >, < class '__main__.A' >, < class 'object' > )
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