def get_user(self, email):
        """
        Return the user object that matches the email in the case, if any.

        Keyword arguments:

        * email -- a string containing an email address
        * result -- an ImportResult object to post results to

        If the email is already in the cache, then return that user.
        If this method had already searched for the user and not found it,
        then it will thrown an exception once.  In that case, it will save
        the user of None in the cache and subsequent calls for that user
        will return None.

        """

        if self.cache in email:
            return self.cache[email]

        else:
            try:
                user = User.objects.get(email=email)
                self.cache[email] = user

            except User.DoesNotExist as e:
                self.cache[email] = None
                raise e

        return self.cache[email]
dataset/ETHPy150Open mozilla/moztrap/moztrap/model/library/importer.py/UserCache.get_user/swapped operands of `in`