Python装机选购程序实现已选商品小计与总价计算

原有代码问题 #

• 原choice函数仅完成选项展示、用户输入和选择提示，未返回选中的商品信息，选品数据没有留存
• 未设置专门的存储结构保存所有已选商品，无法统一汇总输出条目、计算总价
• 之前测试用的字典同key值累加逻辑，不适合存储独立的商品条目，存储多件已选商品用列表结构更适配
• 原代码输入校验存在笔误，校验规则包含菜单不存在的选项8，且没有对用户输入的非数字、不存在的选项序号做拦截，容易触发报错

原有参考代码 #

测试字典累加逻辑代码 #

dict1 = [{'ca':2, 'na':3},{'ca':3, 'na':4}]

final = {}
for d in dict1:
    for k in d.keys():
        final[k] = final.get(k,0) + d[k]

print (final)

未完成的业务代码 #

cpu = {
    1: ("AMD Ryzen 5 5600X", 190),
    2: ("AMD Ryzen 7 5800X", 260),
    3: ("AMD Ryzen 9 5900X", 350),
    4: ("AMD Ryzen 9 5950X", 500),
    5: ("Intel Core i5-12400F", 135),
    6: ("Intel Core i7-12700K", 350),
    7: ("Intel Core i9-12900k", 500)
}

gpu={
    1: ("Nvidia Geforce RTX 3050", 300),
    2: ("Nvidia Geforce RTX 3060", 400),
    3: ("Nvidia Geforce RTX 3070", 600),
    4: ("Nvidia Geforce RTX 3080", 900),
    5: ("Nvidia Geforce RTX 3090", 1500)
}

store = {
    1: ("Samsung 970 EVO plus", 100),
    2: ("Samsung 980 PRO", 300),
    3: ("Seagate Barracuda Compute", 50),
    4: ("Kingston A400", 25),
    5: ("Seagate Ironwolf PRO", 500)
}

ram = {
    1: ("Crucial BallistiX", 40),
    2: ("Corsair Vengance Pro RGB", 80),
    3: ("Tiden Z RGB", 152),
    4: ("G.Skills Ripjaws V", 262),
    5: ("ADATA XPG LANCER RGB", 300)
}

cooler = {
    1: ("NZXT Kraken X53", 100),
    2: ("Noctua NHD-15", 90),
    3: ("ASUS ROG StiX", 240),
}

cases = {
    1: ("NZXT H510 ELITE", 150),
    2: ("Lian LI 011 Dynamic", 208),
    3: ("Corsair Carbide", 50)
}

def choice( menu ):
    for k,v in menu.items():
        print( f"{k}: {v[0]} £{v[1]}" )
    val = int(input("Make your choice by number:" ))
    print( f"You have chosen the {menu[val][0]} for £{menu[val][1]}" )


menu_choice=input("What would you like to buy today? [1: CPU's] [2: GPU's] [3: Storage] [4: RAM] [5: CPU Cooler] [6: Cases] [7: One of each] [Type the number that you want.]: ")

if menu_choice not in "12345678":
    print("You did not choose something or put in the wrong number.")
    exit()

if menu_choice in "17":
    print("Choose your CPU.:")
    c = choice(cpu)
if menu_choice in "27":
    print("GPU's, press enter to go to the next product:")
    c = choice(gpu)
if menu_choice in "37":
    print("Storage, press enter to go to the next product:")
    c = choice(store)
if menu_choice in "47":
    print("RAM, press enter to go to the next product:")
    c = choice(ram)
if menu_choice in "57":
    c = choice(cooler)
if menu_choice in "67":
    c = choice(cases)

修改后可实现需求的完整代码 #

核心调整逻辑：

• 给choice函数增加返回值，返回用户选中的（商品名，价格）元组，补全输入合法性校验，避免非法输入触发程序崩溃
• 初始化selected_items空列表，每次选完商品就把返回的商品信息追加到列表中
• 所有选品流程结束后，遍历列表打印全量已选商品，累加计算总价格并输出

cpu = {
    1: ("AMD Ryzen 5 5600X", 190),
    2: ("AMD Ryzen 7 5800X", 260),
    3: ("AMD Ryzen 9 5900X", 350),
    4: ("AMD Ryzen 9 5950X", 500),
    5: ("Intel Core i5-12400F", 135),
    6: ("Intel Core i7-12700K", 350),
    7: ("Intel Core i9-12900k", 500)
}

gpu={
    1: ("Nvidia Geforce RTX 3050", 300),
    2: ("Nvidia Geforce RTX 3060", 400),
    3: ("Nvidia Geforce RTX 3070", 600),
    4: ("Nvidia Geforce RTX 3080", 900),
    5: ("Nvidia Geforce RTX 3090", 1500)
}

store = {
    1: ("Samsung 970 EVO plus", 100),
    2: ("Samsung 980 PRO", 300),
    3: ("Seagate Barracuda Compute", 50),
    4: ("Kingston A400", 25),
    5: ("Seagate Ironwolf PRO", 500)
}

ram = {
    1: ("Crucial BallistiX", 40),
    2: ("Corsair Vengance Pro RGB", 80),
    3: ("Tiden Z RGB", 152),
    4: ("G.Skills Ripjaws V", 262),
    5: ("ADATA XPG LANCER RGB", 300)
}

cooler = {
    1: ("NZXT Kraken X53", 100),
    2: ("Noctua NHD-15", 90),
    3: ("ASUS ROG StiX", 240),
}

cases = {
    1: ("NZXT H510 ELITE", 150),
    2: ("Lian LI 011 Dynamic", 208),
    3: ("Corsair Carbide", 50)
}

def choice(menu):
    for k,v in menu.items():
        print(f"{k}: {v[0]} £{v[1]}")
    while True:
        try:
            val = int(input("Make your choice by number: "))
            if val not in menu.keys():
                print("Invalid option, please enter a number from the list above.")
                continue
            break
        except ValueError:
            print("Please enter a valid number.")
    selected = menu[val]
    print(f"You have chosen the {selected[0]} for £{selected[1]}")
    return selected

selected_items = []
total_price = 0

menu_choice = input("What would you like to buy today? [1: CPU's] [2: GPU's] [3: Storage] [4: RAM] [5: CPU Cooler] [6: Cases] [7: One of each] [Type the number that you want.]: ")

if menu_choice not in "1234567":
    print("You did not choose something or put in the wrong number.")
    exit()
menu_choice = int(menu_choice)

if menu_choice in (1,7):
    print("Choose your CPU.:")
    selected_items.append(choice(cpu))
if menu_choice in (2,7):
    print("GPU's, press enter to go to the next product:")
    selected_items.append(choice(gpu))
if menu_choice in (3,7):
    print("Storage, press enter to go to the next product:")
    selected_items.append(choice(store))
if menu_choice in (4,7):
    print("RAM, press enter to go to the next product:")
    selected_items.append(choice(ram))
if menu_choice in (5,7):
    print("Choose your CPU cooler:")
    selected_items.append(choice(cooler))
if menu_choice in (6,7):
    print("Choose your case:")
    selected_items.append(choice(cases))

print("\n" + "="*30)
print("Your selected items:")
for item_name, item_price in selected_items:
    print(f"- {item_name}: £{item_price}")
    total_price += item_price
print("="*30)
print(f"*Total cost: £{total_price}*")

运行效果 #

输入7选择全品类各选一件模式时，程序会依次引导用户选择每个品类的配件，所有选择完成后自动列出全部选中的商品条目，最后输出合计总价。单独选择某一个品类时，也会正常输出对应选品和价格。

内容的提问来源于stack exchange，提问作者MaxStrongman