trick(三)、函数参数前面单星号（*）和双星号（**）的区别

def foo(param1, *param2):
def bar(param1, **param2):

>>> def foo(param1, *param2):
        print param1
        print param2
>>> foo(1,2,3,4,5)
1
(2, 3, 4, 5)

>>> def bar(param1, **param2):
        print param1
        print param2
>>> bar(1,a=2,b=3)
1
{'a': 2, 'b': 3}

>>> def foo(bar, lee):
        print bar, lee
>>> l = [1, 2]
>>> foo(*l)
1 2

>>> def foo(a, b=10, *args, **kwargs):
        print a
        print b
        print args
        print kwargs
>>> foo(1, 2, 3, 4, e=5, f=6, g=7)
1
2
3 4
{'e': 5, 'g': 7, 'f': 6}