Python入门 第二节 作业一

# 购物车程序
# 1）启动程序后，让用户输入工资，然后打印商品列表
# 2）允许用户根据商品编号购买商品
# 3）用户选择商品后，检查余额是否够，够就直接扣款，不够就提醒
# 4）可随时退出，退出时，打印已购买商品和余额
# 5)用户入口：
#      1.商品信息存在文件里
#      2.已购商品，余额记录
# 6）商家入口：
#      1.可以添加商品，修改商品价格

商家入口

list_of_goods = [["苹果","25"],["鸡蛋","60"],["书","100"],["手机","2000"],["电脑","4000"],["自行车","800"],["耳机","150"],["足球","190"],["篮球","150"]]
f = open('D:\\catalogue.txt', 'w')
f.truncate()
f.close()
for i in range(0,len(list_of_goods)):
    f = open('D:\\catalogue.txt', 'a')
    f.write(list_of_goods[i][0])
    f.write('\n')
    f.write(list_of_goods[i][1])
    f.write('\n')
    f.close()
n = 1
while n > 0:
    shelves = input("增加商品？")
    if shelves == "yes":
        goods = input("商品名称：")
        price = input("商品价格：")
        list_of_goods.append([goods, price])
        f = open('D:\\catalogue.txt', 'w')
        f.truncate()
        f.close()
        for i in range(0, len(list_of_goods)):
            f = open('D:\\catalogue.txt', 'a')
            f.write(list_of_goods[i][0])
            f.write('\n')
            f.write(list_of_goods[i][1])
            f.write('\n')
            f.close()

    else:
        n = 0

m = 1
while m > 0:
    amend = input("修改价格？")
    if amend == "yes":
        goods = input("商品名称：")
        price = input("商品价格：")
        for i in range(0, len(list_of_goods)):
            if list_of_goods[i][0] == goods:
                list_of_goods[i][1] = price
                break
            else:
                pass
        f = open('D:\\catalogue.txt', 'w')
        f.truncate()
        f.close()
        for i in range(0, len(list_of_goods)):
            f = open('D:\\catalogue.txt', 'a')
            f.write(list_of_goods[i][0])
            f.write('\n')
            f.write(list_of_goods[i][1])
            f.write('\n')
            f.close()
    else:
        m = 0

v = 1
while v > 0:
    sold_out = input("下架商品？")
    if sold_out == "yes":
        goods = input("商品名称：")
        for j in range(0, len(list_of_goods)):
            if list_of_goods[j][0] == goods:
                del list_of_goods[j]
                break
            else:
                pass
        f = open('D:\\catalogue.txt', 'w')
        f.truncate()
        f.close()
        for i in range(0, len(list_of_goods)):
            f = open('D:\\catalogue.txt', 'a')
            f.write(list_of_goods[i][0])
            f.write('\n')
            f.write(list_of_goods[i][1])
            f.write('\n')
            f.close()
    else:
        v = 0

用户入口

have_been_bought = []

import os
if os.path.getsize('D:\\salary.txt'):
    f = open('D:\\salary.txt', 'r')
    salary = f.read()
    f.close()
else:
    salary = input("Salary:")

for i in range(0,len(open(r"D:\\catalogue.txt",'rU').readlines())):
    with open("D:\\catalogue.txt", 'r') as x:
        if i % 2 == 0:
            print(i / 2)
            line = x.readlines()
            first_line = line[i]
            second_line = line[i+1]
            print( first_line,second_line)
m = 1
while m>0:
    buy = input("你想要买什么？")
    while buy.isdigit() is True:
        if 0 < int(buy)<=(len(open(r"D:\\catalogue.txt",'rU').readlines())/2):
            with open("D:\\catalogue.txt", 'r') as x:
                line = x.readlines()
                goods = line[2*int(buy)]
                prace = line[2 * int(buy) + 1]
                goods = goods.strip('\n')
                prace = prace.strip('\n')
                salary = int(salary) - int(prace)
                if int(salary) >= 0:
                    have_been_bought.append([goods,prace])
                    f = open('D:\\shopping.txt', 'a')
                    f.write(goods)
                    f.write(prace)
                    f.write("\n")
                    f.close()
                    break
                else:
                    print("余额不足！")
                    salary = int(salary) + int(prace)
                    break


        else:
            pass
    else:
        if buy == "no":
            m = 0
        else:
            pass
f = open('D:\\salary.txt', 'w+')
f.write(str(salary))
f.close()
print("您本次购买：",have_been_bought)
print("你的余额为：",salary)
print("您总共购买了：")
g=open('D:\\shopping.txt','r')
content = g.read()
print(content)