python入门之函数

//函数的定义和调用
def sayHello():
  print 'hello,python!';

sayHello();

//局部变量、全局变量

#全局变量
a = 10
def fun1():

  #局部变量
  a = 3

  #全局变量
  global b

  b = 100

  pirnt b

  print a

#默认参数
def sendEmail(context,toUser = 'test@jb200.com'):
    print 'send to '+toUser +" "  +context

#关键参数
sendEmail(context='nihao',toUser='790896688@qq.com')

#docStrings的写法和读发
def sendEmail(context = '',toUser = 'test@jb200.com'):
    '''context is the context to send ,
        toUser is the adrress of email to send'''
    print 'send '+context+' to '+toUser

sendEmail.__doc__