Day 15 列表、字典、集合

一、元素分类

有如下值集合 [11,22,33,44,55,66,77,88,99,90...]，将所有大于 66 的值保存至字典的第一个key中，将小于 66 的值保存至第二个key的值中。

即： {'k1': 大于66的所有值, 'k2': 小于66的所有值}

list = [11,22,33,44,55,66,77,88,99,90]dict ={'k1':[] , 'k2':[]}for x in list:    if x >66:        dict.get('k1').append(x)    else:        dict.get('k2').append(x)print(dict)

二、查找

查找列表中元素，移除每个元素的空格，并查找以 a或A开头 并且以 c 结尾的所有元素。

    li = ["alec", " aric", "Alex", "Tony", "rain"]
    tu = ("alec", " aric", "Alex", "Tony", "rain") 
    dic = {'k1': "alex", 'k2': ' aric',  "k3": "Alex", "k4": "Tony"}

li = ["alec", " aric", "Alex", "Tony", "rain"]for i in range(len(li)):    li[i]=li[i].strip()    if (li[i].startswith('a') or li[i].startswith('A')) and li[i].endswith('c'):        print(li[i])print(li)tu = ("alec", " aric", "Alex", "Tony", "rain")z = list(tu)for i in range(len(z)):    z[i] = z[i].strip()    if (z[i].startswith('a') or z[i].startswith('A')) and z[i].endswith('c'):        print(z[i])        tu = tuple(z)print(tu)dic = {'k1': "alex", 'k2': ' aric',  "k3": "Alex", "k4": "Tony"}for i in dic:    key = dic[i]    key = key.strip()    dic[i] = key    if (key.startswith('a') or key.startswith('A')) and key.endswith('c'):        print(key)print(dic)

三、

输出商品列表，用户输入序号，显示用户选中的商品。

li = ["手机", "电脑", '鼠标垫', '游艇']for i,j in enumerate(li):    print(i+1,j,end=' ')while True:    a = (input('\n请输入商品序号：'))    if a.isspace() or not a:        print('输入为空，请重新输入：')        continue    elif a.isdigit() == True :        break    else:        print('输入非数字，请重新输入：')        continueprint('所选商品：', li[int(a) - 1])

四、购物车
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},

]

shopcart = []   #定义购物车为空列表tag = Truewhile tag:    money = input('请输入总资产：')    if money.isdigit():     #判断输入是否为数字        money = int(money)    else:        print('输入有误，请重新输入！')        continue    while tag:        print('商品列表'.center(46,'='))        for i,j in enumerate(goods):            print(i+1,j['name'],j['price'])     #商品序号 起始0+1        choice = input('请选择商品序号(充值:w 移除商品:e 查看购物车:r 结算:t 退出:q)：')        if choice.isdigit():            choice = int(choice)            if choice <= len(goods) and choice !=0:     #在序号范围内且不为0                item = goods[choice - 1]    #对应 序号-1                if item['price'] <= money:      #商品总额不大于总资产                    shopcart.append(item)       #加入购物车                    money -= item['price']                    print('选购列表'.center(46,'-'))                    for list in shopcart:                        print('[',list['name'],list['price'],']',end=' ')                    print('\n','当前余额为%s' %money )                else:                    print('余额为%s,无法购买,请充值。' %money)            else:                print('输入有误，请重新输入！')        elif choice == 'w':     #充值            while True:                print('充值'.center(48, '='))                money1 = input('请输入充值金额(返回：b)：')                if money1 == 'b':                    break                if money1.isdigit():                    money += int(money1)    #类型转换                    print('当前可用余额为：%s' %money)                    break                else:                    print('输入有误，请重新输入！')        elif choice == 'e':     #修改购物车            while True:                print('移除商品'.center(46, '='))                for m,n in enumerate(shopcart):                    print(m + 1,'[',n['name'],n['price'],']')                remove = input('请输入移除商品序号(返回：b)：')                if remove == 'b':                    break                if remove.isdigit():                    remove = int(remove)                    if remove <= len(shopcart) and remove !=0:                        item1 = shopcart[remove - 1]                        del shopcart[remove - 1]                        money += item1['price']                        print('选购列表'.center(46,'-'))                        for list1 in shopcart:                            print('[',list1['name'],list1['price'],']',end=' ,')                        print('\n','已移除商品[%s]，当前可用余额为：%s' %(item1['name'] , money))                    if len(shopcart) == 0:                        print('当前购物车为空,返回商品列表。')                        break                else:                    print('输入有误，请输入商品序号！')        elif choice == 'r':     #查看购物车            while True:                print('查看购物车'.center(45, '='))                for x, y in enumerate(shopcart):                    print(x + 1, '[', y['name'], y['price'], ']')                print('余额：%s' % money)                inp = input('输入[b]返回：')                if inp == 'b':                    break                else:                    print('输入有误，请重新输入！')        elif choice == 't':     #商品结算            print('结算'.center(48,'='))            for list in shopcart:                print('[',list['name'], list['price'],']')      #显示选购商品            print('余额：%s' % money)            print(50 * '=')            print('欢迎下次光临！')            tag = False     #退出循环        elif choice == 'q':            print(50 * '=')            print('欢迎下次光临！')            tag = False        else:            print('输入有误，请重新输入！')

选做题：用户交互，显示省市县三级联动的选择


dic = {
    "河北": {
        "石家庄": ["鹿泉", "藁城", "元氏"],
        "邯郸": ["永年", "涉县", "磁县"],
    }
    "河南": {
        ...
    }
    "山西": {
        ...
    }
 
}