code: def delete(self, config_file=None):
          
          path_to_remove = config_file or _DEFAULT_PATH
          try:
              os.remove(path_to_remove)
              print('Credentials at {} successfully removed.'.format(
                  path_to_remove))
          except OSError as err:
              warnings.warn('No credential file found at {}.'.format(
                  path_to_remove))
docs: Deletes the credentials file specified in `config_file`. If no
          file is specified, it deletes the default user credential file.
  
          Args:
              config_file (str): Path to configuration file. Defaults to delete
                  the user default location if `None`.
  
          .. Tip::
  
              To see if there is a default user credential file stored, do the
              following::
  
                  >>> creds = Credentials()
                  >>> print(creds)
                  Credentials(username=eschbacher, key=abcdefg,
                          base_url=https://eschbacher.carto.com/)