轉載自部落格園：
http://www.cnblogs.com/moodlxs/p/3232222.html

當函式的引數不確定時，可以使用*args 和**kwargs，*args 沒有key值，**kwargs有key值。

話不多說直接上程式碼

[python]

def fun_var_args(farg, *args): 
    print "arg:", farg 
    for value in args: 
        print "another arg:", value 

fun_var_args(1, “two”, 3) # *args可以當作可容納多個變數組成的list
result:
[python]

arg: 1 
another arg: two 
another arg: 3 
**kwargs:
[python] 
def fun_var_kwargs(farg, **kwargs): 
    print "arg:", farg 
    for key in kwargs: 
        print "another keyword arg: %s: %s" % (key, kwargs[key]) 

fun_var_kwargs(farg=1, myarg2=”two”, myarg3=3) # myarg2和myarg3被視為key， 感覺**kwargs可以當作容納多個key和value的dictionary
result:
[python]
arg: 1
another keyword arg: myarg2: two
another keyword arg: myarg3: 3
也可以用下面的形式：
[python]

def fun_var_args_call(arg1, arg2, arg3): 
    print "arg1:", arg1 
    print "arg2:", arg2 
    print "arg3:", arg3 

args = ["two", 3] #list 

fun_var_args_call(1, *args) 
result：
[python] 
arg1: 1 
arg2: two 
arg3: 3 

[python]

def fun_var_args_call(arg1, arg2, arg3): 
    print "arg1:", arg1 
    print
 
 "arg2:", arg2 
    print "arg3:", arg3 

kwargs = {"arg3": 3, "arg2": "two"} # dictionary 

fun_var_args_call(1, **kwargs) 
result：
[python] view plaincopyprint?
arg1: 1 
arg2:"two" 
arg3:3