reflection.py 文件源码

def get_callable_args(function, required_only=False):
    """Get names of callable arguments.

    Special arguments (like ``*args`` and ``**kwargs``) are not included into
    output.

    If required_only is True, optional arguments (with default values)
    are not included into output.
    """
    sig = get_signature(function)
    function_args = list(six.iterkeys(sig.parameters))
    for param_name, p in six.iteritems(sig.parameters):
        if (p.kind in (Parameter.VAR_POSITIONAL, Parameter.VAR_KEYWORD)
                or (required_only and p.default is not Parameter.empty)):
            function_args.remove(param_name)
    return function_args