当函数的参数是可变参数是，使用*args和**kwargs。其中*args对应的可变参数不含key，而**kwargs对应的可变参数含有key。
*args的使用：
1 >>> def fun1(*args): 2 ... for item in args: 3 ... print item 4 ... 5 >>> fun1(1, ‘hello‘, True) 6 1 7 hello 8 True
或者：
1 >>> def fun1_1(arg1, arg2, arg3): 2 ... print arg1 3 ... print arg2 4 ... print arg3 5 ... 6 >>> args = [‘hello‘, 3] 7 >>> 8 >>> fun1_1(‘test‘, *args) 9 test 10 hello 11 3
**kwargs的使用:
1 >>> def fun2(**kwargs): 2 ... for k in kwargs: 3 ... print "%s:%s" % (k, kwargs[k]) 4 ... 5 >>> fun2(hello=1, world=2, welcome=3) 6 world:2 7 welcome:3 8 hello:1
或者：
1 >>> def fun2_2(arg1, hello, world): 2 ... print ‘arg1:‘, arg1 3 ... print ‘arg2:‘, hello 4 ... print ‘arg3:‘, world 5 ... 6 >>> kwargs = {‘hello‘:3, ‘world‘:2} 7 >>> fun2_2(1, **kwargs) 8 arg1: 1 9 arg2: 3 10 arg3: 2
原文：http://www.cnblogs.com/la0bei/p/5332728.html