python3 ' Simple To-Do List Manager '

python3.py

import os
import json

TASKS_FILE = "tasks.json"

def load_tasks():
    """Load tasks from file if it exists"""
    if os.path.exists(TASKS_FILE):
        try:
            with open(TASKS_FILE, 'r') as f:
                return json.load(f)
        except:
            return []
    return []

def save_tasks(tasks):
    """Save tasks to file"""
    with open(TASKS_FILE, 'w') as f:
        json.dump(tasks, f, indent=2)

def show_tasks(tasks):
    """Display all tasks"""
    if not tasks:
        print("No tasks yet! Add some using option 1 ")
        return
    
    print("\n YOUR TASKS:)")
    print("-" * 30)
    for i, task in enumerate(tasks, 1):
        status = ":)" if task.get('done') else ":()"
        print(f"{i}. {status} {task['title']} ({task['category']})")
    print("-" * 30)

def add_task(tasks):
    """Add new task"""
    title = input("Enter task title: ")
    category = input("Enter category (work/personal/other): ")
    tasks.append({'title': title, 'category': category, 'done': False})
    print("Task added! ")

def toggle_task(tasks):
    """Mark task as done/undone"""
    show_tasks(tasks)
    if not tasks:
        return
    
    try:
        num = int(input("Enter task number to toggle (0 to cancel): "))
        if 1 <= num <= len(tasks):
            tasks[num-1]['done'] = not tasks[num-1]['done']
            print("Task updated ")
        else:
            print("Invalid number!")
    except ValueError:
        print("Please enter a number!")

def main():
    tasks = load_tasks()
    print(" Welcome to Simple To-Do List")
    
    while True:
        print("\n[1] Add task")
        print("[2] View tasks") 
        print("[3] Toggle task done")
        print("[4] Quit")
        
        choice = input("Choose (1-4): ").strip()
        
        if choice == '1':
            add_task(tasks)
        elif choice == '2':
            show_tasks(tasks)
        elif choice == '3':
            toggle_task(tasks)
        elif choice == '4':
            save_tasks(tasks)
            print("Tasks saved! Bye ")
            break
        else:
            print("Oops, pick 1-4 please!")

if __name__ == "__main__":
    main()