【Python】-016-函数-回调

callback，在函数A中将另一个函数作为参数 callback，函数A中调用callback，执行完后在返回函数A

理解为函数中需要使用到另一个函数，执行完返回之前的函数中

一些例子

# coding: UTF-8

def test(callback):  //将函数当做变量，函数内调用其他函数
    print "Test function."
    callback()

def testFuncList(callback):
    print "Test fucntion list."
    for func in callback:
        func()

def cb1():
    print "The CallBack One."

def cb2():
    print "The CallBack Two."

if __name__ == "__main__":
    test(cb1)
    test(cb2)  //函数名作为参数
    testFuncList([cb1, cb2])  //函数名列表作为参数

稍微复杂的例子，需求如图

不同顾客需要使用不同的函数，发送消息

 def sendEmail(address, content):
     print "Send: ", content, "to: ", address

 def sendQQ(address, content):
     print "Send: ", content, "to: ", address

 def sendWeixin(address, content):
     print "Send: ", content, "to: ", address

 def sendSMS(address, content):
     print "Send: ", content, "to: ", address

针对不同的情况，调用不同的函数，利用字典进行封装

sendMethod = {
    "QQ": sendQQ,
    "Email": sendEmail,
    "WeiXin": sendWeixin,
    "DuanXin": sendSMS,
    }

顾客信息如下，来源于文件

QQ,73465937, Chenxiansheng
WeiXin,ffaazf, Xufuren
DuanXin, 1234567890, Wangxiaojie
Email, 111@163.com, Zenglingdao

给顾客发送消息

def Info(content, customFile):
    f = open(customFile, "r")
    for line in f:
        nonblankline = re.sub(r'\s', '',line)
        wordlist = nonblankline.split(',')
        print wordlist
        if wordlist[0] in sendMethod.keys():
            sendMethod[wordlist[0]](wordlist[1], content)

if __name__ == "__main__":
    Info("Buy RED BULL at $10", "/Users/caoweiwei/Box Sync/pythonTEST/custom_info.txt")