如何让Python购物清单程序在终端与文件中逐行打印条目？

你的代码当前的问题是：所有购物条目被直接拼接成无换行的字符串，导致写入文件和终端输出时内容挤在一起，没有逐行显示。下面提供两种可行的修改方案：

方案1：直接在每个条目后添加换行符 #

修改输入累加的逻辑，每次获取用户输入后追加换行符，确保每个条目之间有换行分隔：

#By Simeon Beckford-Tongs BSc MSc Copyright © 2024. All rights reserved. By Simeon Beckford-Tongs BSc MSc Copyright © 2024. All rights reserved. 

items = input('What is the first item on your shopping list:\n') + '\n'
items += input('What is the second item on your shopping list:\n') + '\n'
items += input('What is the third item on your shopping list:\n') + '\n'
items += input('What is the fourth item on your shopping list:\n') + '\n'
items += input('What is the fith item on your shopping list:\n') + '\n'
items += input('What is the sixth item on your shopping list:\n') + '\n'
items += input('What is the seventh item on your shopping list:\n') + '\n'
items += input('What is the eighth item on your shopping list:\n') + '\n'
items += input('What is the ninth item on your shopping list:\n') + '\n'
items += input('What is the tenth item on your shopping list:\n') + '\n'

shopping_list = 'shopping list:' 


file = open('shopping_list.txt', 'w')
file.write(items) 
file.close()

file = open('shopping_list.txt', 'r')
for line in file: 
    print(line)  # print默认自带换行，end='\n'可省略
file.close()

方案2：用列表存储条目（更简洁高效） #

重复编写10次输入代码冗余度高，用循环收集条目后再用换行符拼接，代码更简洁易维护：

#By Simeon Beckford-Tongs BSc MSc Copyright © 2024. All rights reserved. By Simeon Beckford-Tongs BSc MSc Copyright © 2024. All rights reserved. 

items = []
# 循环收集10个购物条目，自动处理序数词（1st/2nd/3rd/th）
for i in range(1, 11):
    suffix = "st" if i == 1 else "nd" if i == 2 else "rd" if i == 3 else "th"
    item = input(f'What is the {i}{suffix} item on your shopping list:\n')
    items.append(item)

# 用换行符连接所有条目，生成带换行的字符串
items_str = '\n'.join(items) + '\n'  # 末尾加换行保证文件结尾有空白行（可选）

file = open('shopping_list.txt', 'w')
file.write(items_str) 
file.close()

file = open('shopping_list.txt', 'r')
for line in file: 
    print(line.strip('\n'))  # 避免重复换行（文件行自带换行，print默认再添加一次）
file.close()

两种方案都能实现：每个购物条目在文本文件和终端输出中逐行显示的效果。

内容的提问来源于stack exchange，提问作者Simeon Beckford-Tongs