'Get the names of the registry keys indexed by a value in that key.'

@staticmethod
def _get_indexed_time_zone_keys(index_key='Index'):

    key_names = list(TimeZoneInfo._get_time_zone_key_names())
    def get_index_value(key_name):
        key = TimeZoneInfo._get_time_zone_key(key_name)
        return key[index_key]
    values = map(get_index_value, key_names)
    return zip(values, key_names)
