python學習之登陸購物

#author:yangxiao
'''

購物車需求
用戶入口：
1.商品信息存在文件裏
2.已購商品，餘額記錄。第一次啓動程序時需要記錄工資，第二次啓動程序時談出上次餘額
3.允許用戶根據商品編號購買商品
4.用戶選擇商品後，檢測是否夠，夠就直接扣款，不夠就提醒
5.可隨時退出，退出時，打印移購買商品和餘額
商家入口：
1.可以添加商品，修改商品價格
'''
import os,sys

def user_shopping():
while True:
user_salary = input('請輸入你的充值金額：')
if user_salary.isdigit():
user_salary = int(user_salary)
user_shop_file.write(login_name + '\t')
user_shop_file.write(str(user_salary) + '\n')
for item in product_lists:
print(product_lists.index(item),item)
p_index = product_lists.index(item)
while True:
user_choice = input('請輸入你要選擇的商品：')
if user_choice.isdigit():
user_choice = int(user_choice)
if user_choice <= p_index or user_choice >= 0:
p_item = product_lists[user_choice]
p_item[1] = int(p_item[1])
if user_salary >= p_item[1]:
user_salary -= p_item[1]
global shop_lists
shop_lists.append(p_item)
user_shop_file.seek(0)
user_shop_file.write(login_name + '\t')
user_shop_file.write(str(user_salary) + '\n')
print('商品%s已加入購物車，您還剩%s錢'%(p_item[0],user_salary))

                    else:
                        print('您的金額不錯，請去充值')
                        print('您已購得'.center(30,'*'))
                        print(shop_lists)
                        sys.exit()
                else:
                    print('請輸入範圍內的商品：')
            elif user_choice == 'q':

                sys.exit('退出程序')

            else:('其輸入正確的商品編號')
    else:
        print('請輸入正確的格式')

def user_top():
while True:
user_salary = input('請輸入你要充值的金額：')
if user_salary.isdigit():
user_salary = int(user_salary)
user_salary += int(shop[1])
user_shop_file.seek(0)
user_shop_file.write(login_name + '\t')
user_shop_file.write(str(user_salary) + '\n')
for item in product_lists:
print(product_lists.index(item),item)
p_index = product_lists.index(item)
while True:
user_choice = input('請輸入你要購買的商品：')
user_choice = int(user_choice)
if user_choice <= p_index or user_choice >= p_index:
p_item = product_lists[user_choice]
p_item[1] = int(p_item[1])
if p_item[1] <= user_salary:
user_salary -= p_item[1]
global shop_lists
shop_lists.append(p_item)
user_shop_file.seek(0)
user_shop_file.write(login_name + '\t')
user_shop_file.write(str(user_salary) + '\n')
print('商品%s已加入購物車，您還剩%s錢'%(p_item[0],user_salary))

                else:
                        print('您的金額不錯，請去充值')
                        print('您已購得'.center(30,'*'))
                        print(shop_lists)
                        sys.exit()

            else:
                print('請輸入正確的商品範圍')
    else:
        print('請輸入爭取的格式的格式')

user_name = ''
shop_lists = []
product_lists = []
def product_shop():
user_product_list_file = open('product_file.txt','r+',encoding ='UTF-8')
product_list_item = user_product_list_file.readlines()
for i in product_list_item:
i = eval(i)
product_lists.append(i)

product_shop()
print(product_lists)
user_shop_file =open('user_shop_file.txt','r+')
user_shop_list =user_shop_file.readlines()
for i in user_shop_list:
shop = i.split()

print(i)

if len(user_shop_list) == 0:
login_name = input('請輸入用戶名：')
user_info_file = open('user_info_file.txt','r+')
user_info_list = user_info_file.readlines()
for a in user_info_list:
a = a.split()
if login_name in a:
while True:
login_pwd = input('請輸入密碼')
if login_pwd == a[1]:
print('歡迎進入購物商城')
user_shopping()
else:
print('你輸入的密碼不爭取')

    else:
        sys.exit('用戶名不存在')

else:
login_name = input('請輸入用戶名：')
user_info_file = open('user_info_file.txt','r+')
user_info_list = user_info_file.readlines()
for a in user_info_list:
a = a.split()
if login_name in a:
while True:
login_pwd = input('請輸入密碼')
if login_pwd == a[1]:
print('歡迎進入購物商城')
user_top()