转：http://blog.csdn.net/chenjinyu_tang/article/details/8136841

当函数的参数不确定时，可以使用*args 和**kwargs，*args 没有key值，**kwargs有key值。

还是直接来代码吧，废话少说

（1）*args例子：

1     def fun_var_args(farg, *args):  2         print "arg:", farg  3         for value in args:  4             print "another arg:", value  5       6     fun_var_args(1, "two", 3) # *args可以当作可容纳多个变量组成的list

result:

 arg: 1

another arg: two

another arg: 3  

（2）**kwargs例子：

1     def fun_var_kwargs(farg, **kwargs):  2         print "arg:", farg  3         for key in kwargs:  4             print "another keyword arg: %s: %s" % (key, kwargs[key])  5       6       7     fun_var_kwargs(farg=1, myarg2="two", myarg3=3) # myarg2和myarg3被视为key， 感觉**kwargs可以当作容纳多个key和value的dictionary

result：

arg: 1      another keyword arg: myarg2: two      another keyword arg: myarg3: 3

（3）也可以是用下面方式：

1     def fun_var_args_call(arg1, arg2, arg3):  2         print "arg1:", arg1  3         print "arg2:", arg2  4         print "arg3:", arg3  5       6     args = ["two", 3] #list  7       8     fun_var_args_call(1, *args)

result：

arg1: 1  arg2: two  arg3: 3

（4）**kwargs方式二

1     def fun_var_args_call(arg1, arg2, arg3):  2         print "arg1:", arg1  3         print "arg2:", arg2  4         print "arg3:", arg3  5       6     kwargs = {
   "arg3": 3, "arg2": "two"} # dictionary  7       8     fun_var_args_call(1, **kwargs)

result：

arg1: 1      arg2:"two"      arg3:3