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
