python经典案例

info = {‘name‘:‘jam‘,
        ‘age‘: 24,
        ‘high‘:171
}
while True:
    print(‘=‘*60)                                                  #字符串拼接可以用*
    print(‘===名片管理系统===‘)
    print(‘1.改 2.删  3.查  4.增  5.退出‘)
    c=input(‘请选择：‘)
    if c == ‘1‘:
        res = input(‘请输入要修改的关键词：‘)
        if res == ‘name‘:
            info[‘name‘]=input(‘请输入对应内容：‘)
            print(info)
        elif   res == ‘age‘:
            info[‘age‘]=input(‘请输入对应内容：‘)
            print(info)
        elif   res ==‘high‘:
            info[‘high‘]=input(‘请输入对应内容：‘)
            print(info)
    if c == ‘2‘:
        res1 =input(‘请输入要删除的关键词：‘)
        print(info.pop(res1))
        print(info)
    if c == ‘3‘:
        res2=input(‘请输入要查看的关键词：‘)
        print(info.get(res2))
    if c == ‘4‘:
        res3=input(‘请输入要增加的内容：‘)
        v1=input(‘请输入value：‘)
        print(info.update({}.fromkeys((res3,),v1)))
        print(info)
    if c == ‘5‘:
        print(‘退出本次操作‘)
    else:
        print(‘请输入12345‘)

l1=[]                                 #使用列表，利用下标进行增删改查
while True:
    print(‘*‘*60)
    print(‘==============欢迎进入名片管理系统==============‘)
    print(‘1.查看名片‘)
    print(‘2.添加名片‘)
    print(‘3.修改名片‘)
    print(‘4.删除名片‘)
    print(‘5.退出系统‘)
    choose=input(‘请选择：‘)                     #input输出都是字符串
    if choose==‘1‘:
        i=0
        while i < len(l1):
            print(‘%s->姓名：%s|年龄：%s|身高：%s‘ % (i,l1[i][‘name‘],l1[i][‘age‘],l1[i][‘high‘]))     #第一个%s输出行号，从0开始
            i+=1
        else:
            print(‘空‘)
    elif choose == ‘2‘:
        name=input(‘name:‘).strip()                            #input().strip去除空格
        age=input(‘age:‘).strip()
        high=input(‘high:‘).strip()
        info={‘name‘:name,
              ‘age‘:age,
              ‘high‘:high
        }
        l1.append(info)
        print(‘添加成功‘)
    elif choose == ‘3‘:
        revise=input(‘请选择要修改的名片：‘)
        name1=input(‘name:‘).strip()
        age1=input(‘age:‘).strip()
        highl=input(‘high:‘).strip()
        if name1:                                                             #加入条件语句是为了让用户知道有哪些关键词
            l1[int(revise)][‘name‘]=name1
        if age1:
            l1[int(revise)][‘age‘]=age1
        if highl:
            l1[int(revise)][‘high‘]=highl
            print(‘修改成功‘)
    elif choose == ‘4‘:
        de1=input(‘请输入要删除的名片：‘)
        l1.remove(l1[int(de1)])
        print(‘删除成功‘)
    elif choose == ‘5‘:
        print(‘退出系统‘)
        break
    else:
        print(‘输入错误，请重新输入‘)

import random                                  #import代表导入模块，random是随机数模块
lost = 0
win = 0
ping = 0
while True:                    #循环
    print(‘=‘*60)
    print(‘****************欢迎来猜拳*****************‘)
    print(‘赢：%s      平：%s       输：%s‘ % (win,ping,lost))
    print(‘1.石头  2.剪刀   3.布  4.退出‘)
    robot = random.choice( [‘剪刀‘,‘石头‘,‘布‘])
    h = input(‘请出：‘)
    if (h == ‘1‘ and robot == ‘剪刀‘)or (h == ‘2‘ and robot == ‘布‘) or (h== ‘3‘ and robot == ‘石头‘):             #赢
        win+=1
        print(‘you are the winner‘)
    elif (h == ‘1‘ and robot == ‘石头‘)or (h == ‘2‘ and robot == ‘剪刀‘) or (h== ‘3‘ and robot==‘布‘):             #平
        ping+=1
        print(‘ping‘)
    elif (h == ‘1‘ and robot == ‘布‘) or (h == ‘2‘ and robot == ‘石头‘) or (h == ‘3‘ and robot==‘剪刀‘):           #输
        lost+=1
        print(‘you are loser‘)
    elif h == ‘4‘:
        print(‘退出系统‘)
        break                               #退出循环
    else:
        print(‘输入错误，请重新输入‘)

user = ‘root‘
paw = ‘root‘
count = 0
print(‘***********登录系统***********‘)
while True:
    user1 = input(‘username:‘)
    passwd1 = input(‘passwd:‘)
    if user1 and passwd1:
        print(‘登录成功‘)
        break
    else:
        count+=1
        print(‘用户名或密码错误，请重新输入‘, count)
        if count == 3:
            print(‘密码输入超过三次，请求失败‘)