<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def GetCustomJsonEnumMapping(enum_type, python_name=None, json_name=None):
 """Return the appropriate remapping for the given enum, or None."""

    return _FetchRemapping(enum_type, 'enum',
                           python_name=python_name, json_name=json_name,
                           mappings=_JSON_ENUM_MAPPINGS)