Python购物清单程序打印输出带多余括号引号如何解决

问题原因 #

• 遍历zip生成的配对对象时，没有对返回的二元元组做拆包操作，你代码里的prices变量实际存储的是完整的(商品名, 价格)元组，直接打印元组会输出Python默认的带括号、引号的元组格式，不符合预期。
• 输出逻辑没有添加预期格式中的.、- $等格式字符。

修改方法 #

把最后遍历输出的部分改为拆包元组，再用f-string按预期格式拼接输出即可，修改后的核心代码片段：

zipobj = zip(products, product_price)
for i, (product, price) in enumerate(zipobj, start = 1):
    print(f"{i}. {product} - ${price}")

修改后完整可运行代码 #

products = []
product_price = []


add_product = input("Would you like to add an item?: ")

while add_product == "yes":
    item = input("Enter the product: ")
    products.append(item)
    item_price = input("How much does this item cost? ")
    product_price.append(item_price)
    print(f"{item} has been added to the cart. ")
    add_product = input("Would you like to add an item? ")

print("The contents of the shopping cart are: ")
zipobj = zip(products, product_price)
for i, (product, price) in enumerate(zipobj, start = 1):
    print(f"{i}. {product} - ${price}")

内容的提问来源于stack exchange，提问作者Kudos