utils.py 文件源码

def get_kwarg_names(func):
    """
    Return a list of valid kwargs to function func
    """
    try:
        # Python 3.5
        sig = inspect.signature(func)
    except AttributeError:
        # Below Python 3.5
        args, _, _, defaults = inspect.getargspec(func)
        if defaults:
            kwonlyargs = args[-len(defaults):]
        else:
            kwonlyargs = []
    else:
        kwonlyargs = [p.name for p in sig.parameters.values()
                      if p.default is not p.empty]

    return kwonlyargs