Python函数中*args和**kwargs来传递变长参数的用法
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。
下面的例子，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)
结果如下：
formal arg: 1 another arg: two another arg: 3
这个例子用来展示键值对形式的可变参数列表，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)
执行结果：
formal arg: 1 another keyword arg: myarg2: two another keyword arg: myarg3: 3
调用函数时，使用 *args and **kwargs
这种语法不仅仅是在函数定义的时候可以使用，调用函数的时候也可以使用
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)
执行结果如下：
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)
结果如下:
arg1: 1 arg2: two arg3: 3
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