magictools.py 文件源码

def signature(function):
    """Return the signature of the given function (possibly without variable
    positional and keyword arguments) as a string.

    If available, the result should be determined by function
    :func:`~inspect.signature` of module :mod:`inspect` (Python 3).
    If something wrents wrong, a less general costum made string is
    returned (Python 2).
    """
    try:
        return str(inspect.signature(function))
    except BaseException:
        argspec = inspect.getargspec(function)
        args = argspec.args if argspec.args else []
        defaults = argspec.defaults if argspec.defaults else []
        strings = []
        for arg, default in zip_longest(reversed(args), reversed(defaults)):
            if default is None:
                strings.insert(0, arg)
            else:
                strings.insert(0, '%s=%s' % (arg, default))
        return '(%s)' % ', '.join(strings)