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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read_user_mapping(self, user_name, mount_point=DEFAULT_MOUNT_POINT):
 """Read the GitHub user policy mapping. Supported methods: GET: /auth/{mount_point}/map/users/{user_name}. Produces: 200 application/json :param user_name: GitHub user name :type user_name: str | unicode :param mount_point: The "path" the method/backend was mounted on. :type mount_point: str | unicode :return: The JSON response of the read_user_mapping request. :rtype: dict """

        api_path = '/v1/auth/{mount_point}/map/users/{user_name}'.format(
            mount_point=mount_point,
            user_name=user_name,
        )
        response = self._adapter.get(url=api_path)
        return response.json()