Irit Katriel <iritkatr...@yahoo.com> added the comment:

I don't know whether this is intended behaviour of not, but it seems that 
MagicMock's __init__ is setting the magic methods, every time a mock instance 
is created. I was able to achieve what you tried to write with this class 
definition - it sets __len__ after super.__init__ has done what it needs to do.

class MagicMockChild(MagicMock):
    def __init__(self):
        super().__init__()
        self.__len__ = lambda self : 9

This is not intended to be a satisfying answer, just to show what's going on.

----------
components: +Library (Lib)
nosy: +iritkatriel

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<https://bugs.python.org/issue42019>
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