def get_user_id(self, username):
        """Retrieves the CVAT user ID for the given username.

        Args:
            username: the username

        Returns:
            the user ID, or None if the user was not found
        """
        user_id = self._get_value_update_map(
            username,
            self._user_id_map,
            "username",
            self.user_search_url,
        )

        if username is not None and user_id is None:
            logger.warning("User '%s' not found", username)

        return user_id
Retrieves the CVAT user ID for the given username.

        Args:
            username: the username

        Returns:
            the user ID, or None if the user was not found
        
fiftyone/utils/cvat.py