Python First Day

功能要求：

• 要求用户输入总资产，例如：2000
• 显示商品列表，让用户根据序号选择商品，加入购物车
• 购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。
• 附加：可充值、某商品移除购物车

goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998},
]

答：

goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998},
]
amount = 2000
card = []
print(‘欢迎光临!‘)
while True:
    option = input(‘1.购物\n2.查询购物车\n3.结账\n4.查询余额\n5.充值\n6.退出\n请输入：\n‘)
    if option == ‘1‘:
        for item in goods:
            print(item[‘name‘],item[‘price‘],‘元‘)
        type = ‘y‘
        while type != ‘q‘:
            res = input(‘请输出购买商品：‘)
            for item in goods:
                if res == item[‘name‘]:
                    card.append(item)
                    print(‘已加入购物车‘)
            type = input(‘按任意键继续购买，按q返回主页‘)
    elif option == ‘2‘:
        option_1 = ‘n‘
        while option_1 != ‘q‘:
            type = input(‘查看购物车请按1，删除商品请按2，按q键返回主页‘)
            if type == ‘1‘:
                for item in card:
                    print(item[‘name‘],item[‘price‘],‘元‘)
            elif type == ‘2‘:
                option_2 = ‘n‘
                while option_2 != ‘q‘:
                    res = input(‘请输入要删除的商品名：‘)
                    for item in card:
                        if res == item[‘name‘]:
                            card.remove(item)
                            print(‘删除成功‘)
                    option_2 = input(‘任意键继续删除，按q键返回‘)
            elif type == ‘q‘:
                option_1 = ‘q‘
            else:
                print(‘请正确输入‘)
    elif option == ‘3‘:
        num = 0
        for item in card:
            money = int(item[‘price‘])
            num += money
        if amount >= num:
            amount -=num
            print(‘已结账‘)
            card = []
        else:
            print(‘余额不足‘)
        option_1 = input(‘返回主页请按任意键，退出请按q‘)
        if option_1 == ‘q‘:
            break
        else:
            continue
    elif option == ‘4‘:
        amount_1 = str(amount)
        print(‘当前余额为：‘ + amount_1)
        option_1 = input(‘返回主页请按任意键，退出请按q‘)
        if option_1 == ‘q‘:
            break
        else:
            continue
    elif option == ‘5‘:
        option_2 = ‘n‘
        while option_2 != ‘q‘:
            money = input(‘请输出充值金额：‘)
            if money.isdigit():
                pass
            else:
                print(‘请正确输入！‘)
                continue
            option_1 = input(‘确认请按y，返回请按任意键！‘)
            if option_1 == ‘y‘:
                money = int(money)
                amount += money
                print(‘充值成功‘)
                option_2 = input(‘继续充值请按任意键，返回请按q‘)
            else:
                print(‘充值失败‘)
                option_2 = input(‘继续充值请按任意键，返回请按q‘)
                continue
    elif option == ‘6‘:
        break
    else:
        print(‘请正确输出选项！‘)
        continue
print(‘谢谢光临!‘)

练习3

交互式显示省市县三级联动

答：

dic = {
    "河北":{
        "石家庄" :["鹿泉","藁城","元氏"],
        "邯郸" : ["永年","涉县","磁县"]
    },
    "河南":{
        "郑州":["巩义","登封","新密"],
        "开封":["金明","鼓楼","通许"]
    },
    "山西":{
        "太原":["古交","清徐","阳曲"],
        "大同":["天镇","阳高","广灵"]
    }
}
back = ‘n‘
while back != ‘q‘:
    i = 0
    for item in dic.keys():
        i += 1
        print("%d.%s"%(i,item))
    option = input(‘请输入查询的地区：‘)
    if option not in dic.keys():
        print(‘请正确输出‘)
        back = input(‘退出请按q，按任意键继续‘)
    else:
        back_1 = ‘n‘
        while back_1 != ‘q‘:
            i = 0
            for item in dic[option].keys():
                i += 1
                print("%d.%s"%(i,item))
            option_1 = input(‘请输入查询的地区：‘)
            if option_1 not in dic[option].keys():
                print("请正确输出")
                back_1 = input("返回请按q，退出请按Q,按任意键继续")
                if back_1 == ‘Q‘:
                    print("谢谢使用")
                    exit()
                else:
                    pass
            else:
                back_2 = ‘n‘
                while back_2 != ‘q‘:
                    i = 0
                    for item in dic[option][option_1]:
                        i += 1
                        print("%d.%s"%(i,item))
                    back_2 = input(‘返回请按q，退出请按Q‘)
                    if back_2 == ‘Q‘:
                        print("谢谢使用")
                        exit()
                    else:
                        pass

作业

1. 基于文件存储的用户登录程序（3次登录失败，锁定用户）

答：

db文件为

sys|123456|0
sy|123456|0

f1 = open(‘db‘,‘r‘)
date = f1.read()
f1.close()
user_info_list = []
user_str_list = date.split(‘\n‘)
for item in user_str_list:
    temp = item.split(‘|‘)
    v = {
        ‘name‘:temp[0],
        ‘pwd‘:temp[1],
        ‘num‘:temp[2]
    }
    user_info_list.append(v)

back = ‘n‘
while back != ‘q‘:
    user_name = input(‘请输出用户名：‘)
    import getpass
    user_pwd = getpass.getpass(‘请输出密码：‘)
    option = ‘0‘
    for item in user_info_list:
        if user_name in item[‘name‘]:
            option = ‘0‘
            user_num = int(item[‘num‘])
            if user_num < 3:
                if user_pwd == item[‘pwd‘]:
                    print(‘登录成功！‘)
                    item[‘num‘] = 0
                    exit()
                else:
                    item[‘num‘] = user_num + 1
                    option = ‘1‘
                    break
            else:
                print(‘用户被锁！‘)
                exit()
        else:
            option = ‘1‘
    if option == ‘1‘:
        print(‘用户名密码或错误！‘)
    else:
        pass
    back = input(‘按q退出，任意键继续！‘)

user_str_list = []
for item in user_info_list:
    temp = "%s|%s|%s"%(item[‘name‘],item[‘pwd‘],item[‘num‘])
    user_str_list.append(temp)
target = "%s\n%s"%(user_str_list[0],user_str_list[1])
f2 = open(‘db‘,‘w‘)
f2.write(target)
f2.close()