<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def map_version(self, requirement, local_version):
 """ Maps a local version name to one recognised by the Requirement class Parameters requirement : str Name of the requirement version : str version string """

        if isinstance(self._versions_map, dict):
            version = self._versions_map.get(requirement, {}).get(
                local_version, local_version)
        else:
            version = self._versions_map(requirement, local_version)
        return version