python 编程小实例（2） 四则运算小游戏

从1 到100之间随机选取俩个整数，使用大的数字加上或者除以小的数值。

用户可以输入三次正确答案。三次不对则给出正确答案。

第一步：定义函数框架

def main():
    while True:
        arithmetic()
        try:
            goon = raw_input('next(y/n)').strip()[0]
        except IndexError:
            continue
        except (EOFError,IOError):
            goon = n
        if goon in 'nN':
            break



if __name__ =='__main__':
    main()

第二步：定义四则运算函数 arithmetic( )

import  random
import  operator

ops={'+':operator.add,'-':operator.div}

def arithmetic():
    nums =[random.randint(1,100) for i in range(2)]
    nums.sort(reverse=True)
    op = random.choice('+-')
    print 'op',op
    result = ops[op](*nums)
    print 'result',result
    prompt = '%s%s%s='%(nums[0],op,nums[1])
    tries = 1
    while tries <= 3:
        try:
            answer=int(raw_input(prompt))
        except ValueError:
            print 'input a number'
        except (EOFError,IOError),e:
            print 'Error',e
        if answer == result:
            print 'correct answer'
        else:
            print 'wrong answer'
            tries +=1
    else:
        print 'correct answer :%s%s'%(prompt,result)

第三步：整理函数

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

import  random
import  operator

ops={'+':operator.add,'-':operator.div}

def arithmetic():
    nums =[random.randint(1,100) for i in range(2)]
    nums.sort(reverse=True)
    op = random.choice('+-')
    print 'op',op
    result = ops[op](*nums)
    print 'result',result
    prompt = '%s%s%s='%(nums[0],op,nums[1])
    tries = 1
    while tries <= 3:
        try:
            answer=int(raw_input(prompt))
        except ValueError:
            print 'input a number'
        except (EOFError,IOError),e:
            print 'Error',e
        if answer == result:
            print 'correct answer'
        else:
            print 'wrong answer'
            tries +=1
    else:
        print 'correct answer :%s%s'%(prompt,result)
def main():
    while True:
        arithmetic()
        try:
            goon = raw_input('next(y/n)').strip()[0]
        except IndexError:
            continue
        except (EOFError,IOError):
            goon = n
        if goon in 'nN':
            break



if __name__ =='__main__':
    main()