好久没有学习了，应为工作的需要，再次拾起，唤起记忆。

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 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:

1 arg: 1  2 another arg: two  3 another arg: 3

**kwargs:

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:

1 arg: 1  2 another keyword arg: myarg2: two  3 another keyword arg: myarg3: 3

也可以用下面的形式：

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：

1 arg1: 1  2 arg2: two  3 arg3: 3

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：

1 arg1: 1  2 arg2:"two"  3 arg3:3