def __str__(self):
if self._parents:<EOL><INDENT>return '<STR_LIT>'.format('<STR_LIT:.>'.join(self._parents[::-<NUM_LIT:1>]), self.message)<EOL><DEDENT>else:<EOL><INDENT>return self.message<EOL><DEDENT>
Returns:
    str: A descriptive message of the validation error that may also
        include the path to the validator that failed.