#!/usr/bin/env
python
# python 计算器
#coding=gbk
def yunsuan(userA,userB,operate):
'运算函数'
try:
A = int(userA)
B = int(userB)
operate_list = { '+':(A+B),'-':(A-B),'*':(A * B),'/':(A / B)}
return operate_list[operate]
except KeyError:
return '%s 没有这个运算' % operate
except ValueError:
return '请给我个数字！'
except ZeroDivisionError:
return '%s 不能为除数！' % userB
def user_input():
'获取用户输入'
userA = raw_input('请输入数字A: ')
userB = raw_input('请输入数字B: ')
operate = raw_input('请选择运算符号(+、-、*、/)：')
return yunsuan(userA,userB,operate)
print user_input()
