custom_directives.py 文件源码

def flag(argument):
    """Reimplement directives.flag to return True instead of None
    Check for a valid flag option (no argument) and return ``None``.
    (Directive option conversion function.)

    Raise ``ValueError`` if an argument is found.
    """
    if argument and argument.strip():
        raise ValueError('no argument is allowed; "%s" supplied' % argument)
    else:
        return True