Python2 limit function passed in keyword parameter

In Python2, you can use Kwargs.pop (key, False) in a function to get the value of the restriction keyword parameter by using **kwargs, and if not passed in, set the default value, and when all required keyword parameters are pop, If Kwargs has other content then raise ValueError.

Def key_args_example (A, **kwargs):    key1 = Kwargs.pop ("Key1", "AAA")    Key2 = Kwargs.pop ("Key2", "BBB") # Other keyword parameters to get    if Kwargs:        raise ValueError ("Unrecognized key args in **kwarg%s"%  Kwargs)

　　

Python2 limit function passed in keyword parameter