python switch函数

  python并没有提供switch语句！python可以通过字典实现switch语句的功能。

  1)首先，定义一个字典；

#!/usr/bin/python
#coding:utf8

from __future__  import division#使除非操作自动识别小数结果

def jia(x,y):
    return x+y

def jian(x,y):
    return x-y

def cheng(x,y):
    return x*y

def chu(x,y):
    return x/y

operator = {"+":jia,"-":jian,"*":cheng,"/":chu}
 
print operator["/"](3,2)

def f(x,o,y):
    print operator.get(o)(x,y)#类似switch函数操作

f(3,"/",2)#函数调用