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。

*args

[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可以当作可容纳多个变量组成的list

**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被视为key， 感觉**kwargs可以当作容纳多个key和value的dictionary