python方法参数：*和**操作符

*

def test_args_kwargs(arg1, arg2, arg3):
    print("arg1:", arg1)
    print("arg2:", arg2)
    print("arg3:", arg3)

>>> args = ("two", 3, 5)
>>> test_args_kwargs(*args)
arg1: two
arg2: 3
arg3: 5

**

def fun2(p3, p2):
    print "fun2-begin"
    print p2, p3
    print "fun2-end"

def fun1(p1, **kargs):
    print "fun1-begin"
    print p1
    print kargs
    fun2(**kargs)
    print "fun2-end"

if __name__ == "__main__":
    dic = {"p2":1, "p3":2}
    fun1("p1", **dic)

输出：
fun1-begin
p1
{'p2': 1, 'p3': 2}
fun2-begin
1 2
fun2-end
fun2-end