def get_username(user_id):
 if (user_id == feconf.MIGRATION_BOT_USER_ID):
  return feconf.MIGRATION_BOT_USERNAME
 else:
  return get_user_settings(user_id, strict=True).username

def get_username ( user_id ) : if ( user_id == feconf . MIGRATION_BOT_USER_ID ) : return feconf . MIGRATION_BOT_USERNAME else : return get_user_settings ( user_id , strict = True ) . username
gets username corresponding to the given user_id .