Python Todo 列表不会在新行中添加新的 Todo，而是附加在与上一个 Todo 相同的行上

Question

我是Python初学者。此待办事项列表不是在新行中添加新的待办事项，而是附加在与上一个待办事项相同的行上。当它被添加为“匹配大小写”时，它工作正常，但由于将其更改为“如果添加”，它会附加在同一行上，如：“1. clean car go getgroceries”而不是“1.clean car 2.go get”杂货”。

from unittest import case
from urllib.response import addbase

while True:
    user_action = input("Type add, show, edit, complete or exit : ")
    user_action = user_action.strip()

    if 'add' in user_action or 'new' in user_action or 'more' in user_action:
        todo = user_action[4:]

        with open('todos.txt', 'r') as file:
            todos = file.readlines()

        todos.append(todo)

        with open('todos.txt', 'w') as file:
            file.writelines(todos)

    elif 'show' in user_action:
        with open('todos.txt', 'r') as file:
            todos = file.readlines()


        for index, item in enumerate(todos):
            item = item.strip('\n')
            row = f"{index + 1} - {item}"
            print(row)

    elif 'edit' in user_action:
        number = int(user_action[5:])
        print(number)
        number = number - 1

        with open('todos.txt', 'r') as file:
            todos = file.readlines()
            print('Here are existing todos', todos)

            new_todo = input("Enter a new todo: ")
            todos[number] = new_todo + '\n'

            with open('todos.txt', 'w') as file:
                file.writelines(todos)

    elif 'complete' in user_action:
            number = int(user_action[9:])

            with open('todos.txt', 'r') as file:
                todos = file.readlines()
                index = number - 1
                todo_to_remove = todos[index].strip('\n')
                todos.pop(index)

            with open('todos.txt', 'w') as file:
                file.writelines(todos)

            message = f"Todo {todo_to_remove} was removed from the list."
            print(message)

    elif 'exit' in user_action:
        break

    else:
        print("Invalid input")

print("bye")

我希望代码将 .txt 文件和控制台中的列表输出为枚举行，但现在它在控制台和 .txt 文件中输出文本，并将一行中的所有新待办事项与之前的待办事项合并在一起。

Answer 1

确保添加换行符 ( ) 将其附加到列表时，位于每个待办事项的末尾。这是更正的代码的相关部分：

if 'add' in user_action or 'new' in user_action or 'more' in user_action:
    todo = user_action[4:]
    with open('todos.txt', 'r') as file:
        todos = file.readlines()

    todos.append(todo + "\n")  # Add the new todo with a newline at the end

    with open('todos.txt', 'w') as file:
        file.writelines(todos)