8.09_python_lx_shopping

购物车小程序

(1)购物车程序

money = 0
import time,json
car = {}

def chongzhi():
    while True:
        global money
        qian = input('请充值吧,大哥')
        if qian.isdecimal():
            qian = int(qian)
            money+=qian
            print('恭喜你~ 充值成功{}元人民币'.format(qian))
            break
        else:
            print('充值失败,非数字.')

def jindutiao():
    for i in range(51):
        print('
{}{}%%'.format('*'*i,int(i/50*100)),end='')
        time.sleep(0.05)

def londing():
    print('加载商品中 ... ')
    jindutiao()
    print()

def read_goods(file):
    with open(file,mode='r',encoding='utf-8')as fp:
        lst  = []
        for i in fp:
            dic = json.loads(i)
            lst.append(dic)
        return lst
goods_lst = read_goods('shopping_data.json')
print(goods_lst)

def goods():
    strvar = '商品名称'.center(20)
    strvar = '序号'+strvar+'价格'
    print(strvar)
    for k,v in enumerate(goods_lst,start=1):
        v['num'] = k
        print('{v[num]:<12}{v[name]:<12}{v[price]}'.format(v=v))

def add_goodscar(num):
    if num not in car:
        car[num] = {'name':goods_lst[num-1]['name'],'price':goods_lst[num-1]['price'],'account':1}
    elif num in car:
        car[num]['account']+=1
    print(car)

def show_goodscar(num):
    print('*'*50)
    print('您选择的商品具体信息:')
    print('*-商品名称:{}'.format(car[num]['name']))
    print('*-商品单价:{}'.format(car[num]['price']))
    print('*-商品数量:{}'.format(car[num]['account']))
    print('已成功添加到购物车~ 请继续shopping ~')
    print('*'*50)

def jiesuan():
    total = 0
    print('[-------------------您购物车的具体商品如下:-------------------]')
    for k,v in car.items():
        v['zongjia'] = v['price']*v['account']
        total+=v['zongjia']
        v['num'] = k
        print('序号{v[num]}: 商品名称:{v[name]} 商品单价:{v[price]} 商品数量:{v[account]} 此商品总价:{v[zongjia]}'.format(v=v))
    return total

def del_goodscar(total,money):
    print('余额不足，还差{}元，请忍痛割爱，删除某些商品'.format(total-money))
    del_num = input('[-------------------请输入要删除的商品序号:-------------------]')
    if del_num.isdecimal():
        del_num = int(del_num)
        if del_num in car:
            car[del_num]['account']-=1
            if not car[del_num]['account']:
                car.pop(del_num)
        else:
            error()
    else:
        error()

def success(total,money):
    print('正在结算数据中 ... ')
    jindutiao()
    print('[一共：{}元]'.format(total))
    print('[您已经成功购买以上所有商品 , 余额还剩{}元，感谢您下次光临~]'.format(money-total))
        
def myexit():
    print('[============== 欢迎下次光临: ==============]')
    time.sleep(0.5)

def error():
    print('这是一个错误选项')

def main():
    chongzhi()
    # londing()
    goods()
    sign = True
    while sign == True:
        num = input('请输入您要购买的商品:')
        if num.isdecimal():
            num = int(num)
            if 0 < num <= len(goods_lst):
                add_goodscar(num)
                show_goodscar(num)
            else:
                error()
        
        elif num.upper()=='N':
            while True:
                total = jiesuan()
                if total>money:
                    del_goodscar(total,money)
                else:
                    success(total,money)
                    sign = False
                    break
        elif num.upper()=='Q':
            myexit()        
            sign = False
        else:
            error()
main()

(2)商品文件内容 json文件

{"name":"电脑","price":1999}
{"name":"鼠标","price":10}
{"name":"游艇","price":20}
{"name":"美女","price":998}
{"name":"风油精","price":30}