from：http://blog.csdn.net/chenjinyu_tang/article/details/8136841
好久没有学习python了，应为工作的需要，再次拾起python，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
- def fun_var_args(farg, *args):
- print "arg:", farg
- for value in args:
- print "another arg:", value
- fun_var_args(1, "two", 3) # *args可以当作可容纳多个变量组成的list
result:
- arg: 1
- another arg: two
- another arg: 3
**kwargs:
- 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
也可以用下面的形式：
- 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：
- arg1: 1
- arg2: two
- arg3: 3
- 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：
-
- arg1: 1
- arg2:"two"
- arg3:3
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