python怎么实现购物车

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#!/usr/bin/env python
#!-- coding:utf-8 --
#Author:Eric

My_salary = input("Input your salary:")

if My_salary.isdigit():
My_salary = int(My_salary)
else:
exit("Invaild data type...")

welcome_msg = 'Welcome to Eric Shopping mall'.center(50,'-')
print(welcome_msg)

exit_flag = False
product_list = [
('Iphone',5800),
("Mac Air",8000),
("Mac Pro",9000),
("XiaoMi 2",19.9),
("Coffee",30),
("Tesla",820000),
("Bike",700),
("Cloth",200),]
shop_car = []
while exit_flag is not True:
#for product_item in product_list:
#p_name,p_price = product_item
print("product list".center(50,'-'))
for item in enumerate(product_list): #将列表中的下标进行返回。枚举函数
index = item[0]
p_name = item[1][0]
p_price = item[1][1]
print (index,'.',p_name,p_price)
#print(len(product_list))
user_choice = input("[q = quit,c=check] What do you want to Buy?:")

if user_choice.isdigit():  #肯定是要选择商品。    user_choice = int(user_choice)    if user_choice < len(product_list):        p_item = product_list[user_choice]        if p_item[1] <= My_salary:            shop_car.append(p_item)  #放入购物车            My_salary -=p_item[1]   #减钱            print("Added [%s] into shop car,your current balance is \033[31;1m[%s]\033[0m"                  %(p_item,My_salary))        else:            print("Your balance is [%s],cannot afford this..." %[My_salary])else:    if user_choice == 'q' or user_choice == 'quit':        print("purchased products as below".center(40,'*'))        for item in shop_car:            print(item)        print("END".center(40,'*'))        print('Your balance is [%s]' %My_salary)        exit_flag = True    if user_choice == 'c' or user_choice == 'check':        print("purchased products as below".center(40,'*'))        for item in shop_car:            print(item)        print("END".center(40,'*'))        print('Your balance is [%s]' %My_salary)

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