您可以使用inspect.getargspec() https://docs.python.org/2/library/inspect.html#inspect.getargspec查看接受哪些参数以及关键字参数的默认值。
Demo:
>>> def foo(bar, baz, spam='eggs', **kw): pass
...
>>> import inspect
>>> inspect.getargspec(foo)
ArgSpec(args=['bar', 'baz', 'spam'], varargs=None, keywords='kw', defaults=('eggs',))
>>> inspect.getargspec(foo).args
['bar', 'baz', 'spam']
在Python 3中,你想使用inspect.getfullargspec() https://docs.python.org/3/library/inspect.html#inspect.getfullargspec因为此方法支持新的 Python 3 函数参数功能:
>>> def foo(bar: str, baz: list, spam: str = 'eggs', *, monty: str = 'python', **kw) -> None: pass
...
>>> import inspect
>>> inspect.getfullargspec(foo)
FullArgSpec(args=['bar', 'baz', 'spam'], varargs=None, varkw='kw', defaults=('eggs',), kwonlyargs=['monty'], kwonlydefaults={'monty': 'python'}, annotations={'baz': <class 'list'>, 'return': None, 'spam': <class 'str'>, 'monty': <class 'str'>, 'bar': <class 'str'>})
inspect.getargspec()
在 Python 3 中应该被视为已弃用。
Python 3.4 添加了inspect.Signature() object https://docs.python.org/3/library/inspect.html#introspecting-callables-with-the-signature-object:
>>> inspect.signature(foo)
<inspect.Signature object at 0x100bda588>
>>> str(inspect.signature(foo))
"(bar:str, baz:list, spam:str='eggs', *, monty:str='python', **kw) -> None"
>>> inspect.signature(foo).parameters
mappingproxy(OrderedDict([('bar', <Parameter at 0x100bd67c8 'bar'>), ('baz', <Parameter at 0x100bd6ea8 'baz'>), ('spam', <Parameter at 0x100bd69f8 'spam'>), ('monty', <Parameter at 0x100bd6c28 'monty'>), ('kw', <Parameter at 0x100bd6548 'kw'>)]))
以及更多有趣的签名选项。