def __call__(self, request):
        if self.auth == None:
            return self.auth(request)

        try:
            self.pos = request.body.tell()
        except AttributeError:
            pass

        request.register_hook('response', self.handle_401)
        return request
dataset/ETHPy150Open sigmavirus24/requests-toolbelt/requests_toolbelt/auth/guess.py/GuessAuth.__call__/operator `is not` -> `==`