python练习（二）

1.定义一个函数func(*args),该函数效果如下：

func(222,111,'xian','hahaah') -->'xian'

func(7,'name','fensi') -->'fensi'

func(1,2,3,4)  -->None

#!/usr/bin/env python
#coding:utf-8
def func(*args):
    if isinstance(args[2],str):
        print args[2]
    else:
        print None
func(222,111,'xian','haha')
func(7,'name','fensi')
func(1,2,3,4)

func('Liyulong',age=22,weight=50) -->"name:Liyulong,age:22,weight:50"

#!/usr/bin/env python
#coding:utf-8

def fun(name=None,**kwargs):
    print 'name:' + name
    for k,w in kwargs.items():
        print "%s :%s"%(k,w)
fun('Liyulong')
fun('Liyulong',age=22)
fun('Liyulong',age=22,weight=50)