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我或python是否与以下代码混淆？我希望__le__被召唤a <= ab,而不是__ge__:

#!/usr/bin/env python2

class B(object):
    def __ge__(self, other):
        print("__ge__ unexpectedly called")

class A(object):
    def __le__(self, other):
        print("__le__ called")

class AB(A, B):
    pass

a = A()
ab = AB()

a <= ab # --> __ge__ unexpectedly called
ab <= a # --> __le__ called

我得到了与python 2.7,3.2和pypy 1.9相同的行为.

我该怎么办才能被__le__召唤而不是__ge__？