在Python中：
- 位置参数：会被打包成元组，元组的元素是不可改变的，会根据元组中元素对应关系直接赋值
- 关键字参数：会被打包成字典，字典就是key-value，会根据关键字及其取值完成对应关键字参数的赋值
In [332]: def say_hello_then_call_f(f, *args, **kwargs):
...: print('args is', args)
...: print('kwargs is', kwargs)
...: print('Hello! Now I\'m going to call %s' %f)
...: return f(*args, **kwargs)
...:
In [333]: def g(x,y,z=1):
...: return (x+y)/z
...:
In [334]: say_hello_then_call_f(g,1,2,z=5)
args is (1, 2)
kwargs is {'z': 5}
Hello! Now I'm going to call <function g at 0x10cf6dd30>
Out[334]: 0.6
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