Python函数中*args和**kwargs来传递变长参数的用法

参考自: http://www.jb51.net/article/78705.htm

单星号形式(*args)用来传递非命名键可变参数列表。双星号形式(**kwargs)用来传递键值可变参数列表。

1. 传递了一个固定位置参数和两个变长参数。

def test_var_args(farg, *args):
print "formal arg:", farg
for arg in args:
print "another arg:", arg test_var_args(1, "two", 3) 结果是: formal arg: 1
another arg: two
another arg: 3

2.一个固定参数和两个键值参数。

def test_var_kwargs(farg, **kwargs):
print "formal arg:", farg
for key in kwargs:
print "another keyword arg: %s: %s" % (key, kwargs[key]) test_var_kwargs(farg=1, myarg2="two", myarg3=3) 结果是: formal arg: 1
another keyword arg: myarg2: two
another keyword arg: myarg3: 3

3.  调用函数时,使用 *args and **kwargs

def test_var_args_call(arg1, arg2, arg3):
print "arg1:", arg1
print "arg2:", arg2
print "arg3:", arg3 args = ("two", 3)
test_var_args_call(1, *args) 结果是: arg1: 1
arg2: two
arg3: 3 ------------------------------------------- 键值对方式: def test_var_args_call(arg1, arg2, arg3):
print "arg1:", arg1
print "arg2:", arg2
print "arg3:", arg3 kwargs = {"arg3": 3, "arg2": "two"}
test_var_args_call(1, **kwargs) 结果是: arg1: 1
arg2: two
arg3: 3
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