task_scheduler.py

import json
import os
from datetime import datetime

TASKS_FILE = "tasks.json"

def load_tasks():
    if os.path.exists(TASKS_FILE):
        with open(TASKS_FILE, "r") as f:
            return json.load(f)
    return []

def save_tasks(tasks):
    with open(TASKS_FILE, "w") as f:
        json.dump(tasks, f, indent=4)

def add_task(tasks):
    description = input("Enter task description: ").strip()
    if not description:
        print("Description cannot be empty!")
        return
    due_date = input("Enter due date (YYYY-MM-DD): ").strip()
    try:
        datetime.strptime(due_date, "%Y-%m-%d")
    except ValueError:
        print("Invalid date format! Use YYYY-MM-DD.")
        return
    tasks.append({"description": description, "due_date": due_date, "completed": False})
    save_tasks(tasks)
    print("Task added successfully!")

def list_tasks(tasks):
    if not tasks:
        print("No tasks found.")
        return
    for i, task in enumerate(tasks, 1):
        status = "✓" if task["completed"] else "✗"
        print(f"{i}. {task['description']} (Due: {task['due_date']}) [{status}]")

def complete_task(tasks):
    list_tasks(tasks)
    if not tasks:
        return
    try:
        index = int(input("Enter task number to complete: ")) - 1
        if 0 <= index < len(tasks):
            tasks[index]["completed"] = True
            save_tasks(tasks)
            print("Task marked as completed!")
        else:
            print("Invalid task number!")
    except ValueError:
        print("Enter a valid number!")

def main():
    tasks = load_tasks()
    while True:
        print("\nTask Scheduler")
        print("1. Add Task")
        print("2. List Tasks")
        print("3 W. Complete Task")
        print("4. Exit")
        choice = input("Choose an option (1-4): ").strip()
        
        if choice == "1":
            add_task(tasks)
        elif choice == "2":
            list_tasks(tasks)
        elif choice == "3":
            complete_task(tasks)
        elif choice == "4":
            print("Goodbye!")
            break
        else:
            print("Invalid choice! Try again.")

if __name__ == "__main__":
    main()