todo.py

#!/usr/bin/env python3
import json
import os

TODO_FILE = "todos.json"

def load_todos():
    if os.path.exists(TODO_FILE):
        with open(TODO_FILE) as f:
            return json.load(f)
    return []

def save_todos(todos):
    with open(TODO_FILE, "w") as f:
        json.dump(todos, f, indent=2)

def add_todo(task):
    todos = load_todos()
    todos.append({"task": task, "done": False})
    save_todos(todos)
    print(f"Added: {task}")

def list_todos():
    todos = load_todos()
    for i, todo in enumerate(todos, 1):
        status = "done" if todo["done"] else "pending"
        print(f"{i}. [{status}] {todo['task']}")

if __name__ == "__main__":
    list_todos()