python的函数定义方式

def say():    print("hello world!")say()

通过def关键字来定义python中的函数。

#coding:GBKdef say():    print("hello world!")say()def said(s="mengtianwxs is a good man"):    if len(s)>100:        print "this null"    else:        print(s)said()

默认函数的定义