def list_credentials_by_name(type_name):
  """
  Prints a list of available credential names for the given type_name.
  """
  accounts = get_all_external_accounts(api, type_name)
  account_names = [account.name for account in accounts]
  print ("List of credential names for '{0}': [{1}]".format(
    type_name, COMMA_WITH_SPACE.join(map(str, account_names))))
Prints a list of available credential names for the given type_name.