python实现switch功能

#!/usr/bin/env python
# Filename: switch.py
# Author: zhangliang - [email protected]
# Last modified: 2014-02-26 10:53
# Description:
from __future__ import division
def arithMetic(x,oprator,y):
    result = {
        '+':x+y,
        '-':x-y,
        '*':x*y,
        '/':x/y
    }  
    return result.get(oprator)
x = input('x:')
y = input('y:')
oprator = raw_input('oprator:')
retval = arithMetic(x, oprator, y)
print '%d %s %d = %d' % (x, oprator, y, retval)