作业: 小型购物系统1---按顺序编写

作业：
 用户入口：
 1. 商品信息存在文件里
 2. 已够商品，余额记录
 
 商家入口
 2. 可以添加商品，修改商品价格

 数据文件：商品库：product_store.db

{'book': {'price': 45, 'stocks': 80}, 'watch': {'price': 210, 'stocks': 27}, 'phone': {'price': 1999, 'stocks': 29}, 'apple': {'price': 6, 'stocks': 21}, 'orange': {'price': 4, 'stocks': 23}, 'computer': {'price': 4800, 'stocks': 5}, 'cap': {'price': 56, 'stocks': 13}}

数据文件：购物车：cart_list.db

[]

编码：

# Author:Brace Li
import sys,time

# list entrance for user
print("*" * 60)
print("*%s*" % " ".center(58))
print("*%s*" % "Shopping System".center(58))
print("*%s*" % "v1.00".center(58))
print("*%s*" % "1.For Host   2.For Customer".center(58))
print("*%s*" % " ".center(58))
print("*" * 60)

# for user selected
while True:
    user_selected = input("Pls Input:").strip()
    if not (user_selected and user_selected.isdigit()):
        print("33[1;31;40mError: input error!33[0m ")
        continue
    if not int(user_selected) in (1, 2):
        print("33[1;31;40mError: input error!33[0m ")
        continue
    else:
        break

# for shop host
if int(user_selected) == 1:
    # get product date from database
    with open("product_store.db", "r") as fs:
        product_data = eval(fs.read())
    print("-" * 60)
    print("|{name}|{price}|{balance}|".format(name="Name".center(25, " "), price="Price".center(15, " "), balance="Balance".center(16, " ")))
    print("-" * 60)
    for n in product_data:
        # print(n, product_data[n]["price"], product_data[n]["stocks"])
        print("|{name}|{price}|{balance}|".format(name=n.center(25, " "), price=str(product_data[n]["price"]).center(15, " "), balance=str(product_data[n]["stocks"]).center(16, " ")))
        print("-" * 60)
    # info for action of host
    flag = True
    while True:
        if flag:
            print("*" * 60)
            print("*%s*" % "1.Edit Price   2.Add Products  3. Exit System".center(58, " "))
            print("*" * 60)
        host_selected = input("Pls input:").strip()
        if not (host_selected and host_selected.isdigit()):
            print("33[1;31;40mError: input error!33[0m ")
            flag = False
            continue
        if not int(host_selected) in (1, 2, 3):
            print("33[1;31;40mError: input error!33[0m ")
            flag = False
            continue
        flag = True
        if int(host_selected) == 3:
            with open("product_store.db", "w") as fs:
                fs.write(str(product_data))
            sys.exit("Bye, the system exiting......")
        elif int(host_selected) == 1:
            edit_pro_flag = {"status": False, "sel_pro": ""}
            while True:
                product_selected = input("Input product:").strip()
                if not product_selected:
                    print("33[1;31;40mError: input error!33[0m ")
                    continue
                elif product_selected in product_data:
                    edit_pro_flag["status"] = True
                    edit_pro_flag["sel_pro"] = product_selected
                    break
                else:
                    print("33[1;31;40mError: Product not exist...!33[0m ")
                    continue
            if edit_pro_flag["status"]:
                while True:
                    new_pro_price = input("Input New Price:").strip()
                    if not (new_pro_price and new_pro_price.isdigit()):
                        print("33[1;31;40mError: input error!33[0m ")
                        continue
                    else:
                        product_data[edit_pro_flag["sel_pro"]]["price"] = int(new_pro_price)
                        break
                print("-" * 60)
                print("|{name}|{price}|{balance}|".format(name="Name".center(25, " "), price="Price".center(15, " "),balance="Balance".center(16, " ")))
                print("-" * 60)
                for n in product_data:
                    print("|{name}|{price}|{balance}|".format(name=n.center(25, " "), price=str(product_data[n]["price"]).center(15, " "), balance=str(product_data[n]["stocks"]).center(16, " ")))
                    print("-" * 60)
                edit_pro_flag = {"status": False, "sel_pro": ""}
        else:
            while True:
                pro_name = input("Input Product Name:").strip()
                if not pro_name:
                    print("33[1;31;40mError: input error!33[0m ")
                    continue
                else:
                    break
            if pro_name in product_data:
                while True:
                    add_count = input("the %s  exit, add stocks:" % pro_name).strip()
                    if not (add_count and add_count.isdigit()):
                        print("33[1;31;40mError: input error!33[0m ")
                        continue
                    else:
                        product_data[pro_name]["stocks"] += int(add_count)
                        break
            else:
                while True:
                    add_price = input("Input %s's prince:"% pro_name).strip()
                    if not (add_price and add_price.isdigit()):
                        print("33[1;31;40mError: input error!33[0m ")
                        continue
                    else:
                        break
                while True:
                    add_count = input("Input %s's stocks:" % pro_name)
                    if not (add_count and add_count.isdigit()):
                        print("33[1;31;40mError: input error!33[0m ")
                        continue
                    else:
                        break
                product_data[pro_name] = {'price': int(add_price), 'stocks': int(add_count)}

            print("-" * 60)
            print("|{name}|{price}|{balance}|".format(name="Name".center(25, " "), price="Price".center(15, " "),balance="Balance".center(16, " ")))
            print("-" * 60)
            for n in product_data:
                print("|{name}|{price}|{balance}|".format(name=n.center(25, " "), price=str(product_data[n]["price"]).center(15, " "), balance=str(product_data[n]["stocks"]).center(16, " ")))
                print("-" * 60)

# for customer
if int(user_selected) == 2:
    # load cart data
    with open("cart_list.db", "r") as fs:
        cart_list = eval(fs.read())
    # load list product
    with open("product_store.db", "r") as fs:
        product_data = eval(fs.read())

    while True:
        print("-" * 60)
        print("|{name}|{price}|{balance}|".format(name="Name".center(25, " "), price="Price".center(15, " "), balance="Balance".center(16, " ")))
        print("-" * 60)
        for n in product_data:
            print("|{name}|{price}|{balance}|".format(name=n.center(25, " "), price=str(product_data[n]["price"]).center(15, " "), balance=str(product_data[n]["stocks"]).center(16, " ")))
            print("-" * 60)

        while True:
            select_product = input("Input your products:").strip()
            if not select_product:
                print("33[1;31;40mError: input error!33[0m ")
                continue
            if select_product in product_data:
                cart_list.append(select_product)
                print("33[1;33;40mMsg: Product been in cart successfully!33[0m ")
                break
            else:
                print("33[1;31;40mError: Product not exit!33[0m ")
                continue

        while True:
            print("*" * 60)
            print("*%s*" % "1.Continue  2.Charge  3. Exit System".center(58, " "))
            print("*" * 60)
            customer_action = input("Input select: ").strip()
            if not (customer_action and customer_action.isdigit()):
                print("33[1;31;40mError: input error!33[0m ")
                continue
            if not int(customer_action) in (1, 2, 3):
                print("33[1;31;40mError: input error!33[0m ")
                continue
            if int(customer_action) == 1:
                break
            elif int(customer_action) == 3:
                with open("cart_list.db", "w") as fs:
                     fs.write(str(cart_list))
                sys.exit("System exiting .....!")
            else:
                # list product info in cart
                cart_info = list(set(cart_list))
                print("")
                print("")
                print("*" * 60)
                print("|%s|" %"Products List In Cart".center(58, " "))
                print("-" * 60)
                print("|{id}|{name}|{price}|{quantity}|{total}|".format(id="ID".center(5, " "), name="Name".center(19, " "), price="Price".center(10, " "), quantity="Quantity".center(10, " "), total="Total".center(10, " ")))
                print("-" * 60)
                total_price = 0
                for c_id, c_name in enumerate(cart_info):
                    print("|{id}|{name}|{price}|{quantity}|{total}|".format(id=str(c_id).center(5, " "), name=c_name.center(19, " "), price=str(product_data[c_name]["price"]).center(10, " "), quantity=str(cart_list.count(c_name)).center(10, " "),total=str(product_data[c_name]["price"] * cart_list.count(c_name)).center(10, " ")))
                    print("-" * 60)
                    total_price += product_data[c_name]["price"] * cart_list.count(c_name)

                print("|{data_name}|{date_value}|{total_name}|{total_value}|".format(data_name="Date".center(10," "), date_value=str(time.strftime('%Y-%m-%d',time.localtime())).center(15, " "), total_name="Total".center(10, " "), total_value=str(total_price).center(20, " ")))
                print("-" * 60)
                print()
                print("*" * 60)
                print("*%s*" % "1.Back to Menu  2.Pay Account".center(58, " "))
                print("*" * 60)
                while True:
                    c_selected = input("Pls Input:").strip()
                    if not (c_selected and c_selected.isdigit()):
                        print("33[1;31;40mError: input error!33[0m ")
                        continue
                    if not int(c_selected) in (1, 2):
                        print("33[1;31;40mError: input error!33[0m ")
                        continue
                    else:
                        break
            if int(c_selected) == 2:
                cart_list.clear()
                with open("cart_list.db", "w") as fs:
                    fs.write(str(cart_list))
                    sys.exit("System exiting .....!")
            else:
                break