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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(self, username, mount_point=DEFAULT_MOUNT_POINT):
 """Read the properties of an existing username. Supported methods: GET: /auth/{mount_point}/users/{username}. Produces: 200 application/json :param username: Username for this user. :type username: str | unicode :param mount_point: The "path" the method/backend was mounted on. :type mount_point: str | unicode :return: The JSON response of the request. :rtype: dict """

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