def create_user(self, user_name, path='/'):
        if self.users in user_name:
            raise IAMConflictException("EntityAlreadyExists", "User {0} already exists".format(user_name))

        user = User(user_name, path)
        self.users[user_name] = user
        return user
dataset/ETHPy150Open spulec/moto/moto/iam/models.py/IAMBackend.create_user/swapped operands of `in`