Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

Thanks for the clarification and the answer link. I was also just debugging 
along the similar lines around how OSError.__reduce__ treats the arguments 
something like. Custom __reduce__ for aiohttp works as explained in the SO 
answer.


class SubOSError(OSError):

    def __init__(self, foo, os_error, /):
        self.foo = foo
        self.os_error = os_error
        super().__init__(os_error.errno, os_error.strerror)

    def __reduce__(self): # Custom __reduce__
        return (self.__class__, (self.foo, self.os_error ))

    def __reduce__(self): # OSError __reduce__
        return (self.__class__, (self.os_error.errno, self.os_error.strerror ))

----------
type: crash -> behavior

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38254>
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