Python编写两个数的加减法游戏

目标：

　　1.实现两个数的加减法

　　2.回答者3次输错计算结果后，输出正确结果，并询问回答者是否继续

1.使用常规函数实现两个数的加减法游戏

代码如下：

#!/usr/bin/env python

# -*- coding: utf-8 -*-

'''使用常规函数编写出题游戏'''

import random

def add(x,y):

    return x + y

def sub(x,y):

    return x - y

def chuti():

    cmds = {'+': add, '-': sub}

    ops = '+-'

    op = random.choice(ops)

    nums = [random.randint(1,50) for i in xrange(2)]

    nums.sort(reverse=True)

    prompt = '%s %s %s = ' %(nums[0], op, nums[1])

    anwser = cmds[op](*nums)

    counter = 0

    while counter < 3:

        try:

            result = int(raw_input(prompt))

        except:

            continue

        if anwser == result:

            print "回答正确"

            print "-" * 20

            break

        else:

            counter += 1

            print "回答错误"

            print "-" * 20

    else:

        print "正确答案是: %s %s" % (prompt, anwser)

if __name__ == "__main__":

    while True:

        chuti()

        try:

            yn = raw_input("Continue(y/n?)").strip()[0]

        except IndexError:

            continue

        except (KeyboardInterrupt,EOFError):

            yn = 'n'

        if yn in 'Nn':

            print "结束"

            break

•运行代码，测试效果

[root@localhost python]# python new_mathgame.py

27 + 25 = 5

回答错误

--------------------

27 + 25 = 2

回答错误

--------------------

27 + 25 = 3

回答错误

--------------------

正确答案是: 27 + 25 =  52

Continue(y/n?)y

15 - 1 = 12

回答错误

--------------------

15 - 1 = 13

回答错误

--------------------

15 - 1 = 14

回答正确

--------------------

Continue(y/n?)n

结束

2.使用lambda匿名函数实现两位数的加减法游戏

代码如下：

#!/usr/bin/env python

# -*- coding: utf-8 -*-

'''使用匿名函数lambda编写出题游戏'''

import random

# def add(x,y):

#    return x + y

# def sub(x,y):

#    return x - y

def chuti():

    cmds = {'+': lambda x, y: x + y, '-': lambda x, y: x - y}

    ops = '+-'

    op = random.choice(ops)

    nums = [random.randint(1,50) for i in xrange(2)]

    nums.sort(reverse=True)

    prompt = '%s %s %s = ' %(nums[0], op, nums[1])

    anwser = cmds[op](*nums)

    counter = 0

    while counter < 3:

        try:

            result = int(raw_input(prompt))

        except:

            continue

        if anwser == result:

            print "回答正确"

            print "-" * 20

            break

        else:

            counter += 1

            print "回答错误"

            print "-" * 20

    else:

        print "正确答案是: %s %s" % (prompt, anwser)

if __name__ == "__main__":

    while True:

        chuti()

        try:

            yn = raw_input("Continue(y/n?)").strip()[0]

        except IndexError:

            continue

        except (KeyboardInterrupt,EOFError):

            yn = 'n'

        if yn in 'Nn':

            print "结束"

            break