python-随机加减游戏.(71)

最新推荐文章于 2023-10-22 18:07:05 发布

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本文介绍了一个使用Python编写的随机数学测验程序，该程序能够生成100以内的两个随机数字进行加减运算，确保减法结果非负。用户有三次机会输入正确答案，若全部错误则显示正确答案。

#转自https://www.jianshu.com/c/00c61372c46a网址
#随机生成100以内的两个数字，实现随机的加减法。如果是减法，结果不能是负数。算错三次，给出正确答案
from random import randint,choice

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

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

def exam():
    cmds = {'+':add,'-':sub}
    nums = [randint(1,100) for i in range(2)]   #循环两次，每次从1-100选两个数
    nums.sort(reverse=True) #sort(),排序，reverse=True,反转，最后列表是降序排列
    op = choice('+-')
    result = cmds[op](*nums)    #(*nums),将列表转换成元组，[op],['+']或['-'],cmds[op],字典cmds内[op]对应的值，即add或sub
    prompt = "%s %s %s = " % (nums[0],op,nums[1])
    tries = 0

    while tries < 3:
        try:    #异常处理
            answer = int(input(prompt))
        except: #简单粗暴的捕获所有异常
            continue

        if answer == result:
            print('Very good!')
            break
        else:
            print('Wrong answer')
            tries +=1
    else:   #while的else，全算错才给答案，答对了就不给出答案
        print('%s%s' % (prompt,result))

if __name__ == '__main__':
    while True:
        exam()
        try:    #异常处理
            yn = input("Continue(y/n)?").strip()[0] #去除所有空格，取第一个字符
        except ImportError:
            continue
        except (KeyboardInterrupt,EOFError):
            print()
            yn = 'n'

        if yn in 'Nn':
            break

#或

#转自https://www.jianshu.com/c/00c61372c46a网址

from random import randint,choice

def exam():
    cmds = {'+':lambda x,y:x + y,'-':lambda x,y:x - y}  #lambda,匿名函数
    nums = [randint(1,100) for i in range(2)]
    nums.sort(reverse=True)
    op = choice('+-')
    result = cmds[op](*nums)
    prompt = "%s %s %s = " % (nums[0],op,nums[1])
    tries = 0

    while tries < 3:
        try:
            answer = int(input(prompt))
        except:
            continue

        if answer == result:
            print('Very good!')
            break
        else:
            print('Wrong answer.')
            tries +=1
    else:
        print('%s%s' % (prompt,result))

if __name__ == '__main__':
    while True:
        exam()
        try:
            yn = input("Continue(y/n)?").strip()[0]
        except ImportError:
            continue
        except (KeyboardInterrupt,EOFError):
            print()
            yn = 'n'

        if yn in 'nN':
            break