✅ Python Lesson 08 — CLI Todo Mini Project

Project Goal

Terminal ထဲမှာ run လုပ်တဲ့ Todo app တစ်ခုရေးမယ်။ Add, list, mark done, delete လုပ်နိုင်မယ်။ Data ကို todos.json ထဲသိမ်းမယ်။

1. Full Code

import json
from pathlib import Path

DATA_FILE = Path("todos.json")

def load_todos():
    if DATA_FILE.exists():
        with open(DATA_FILE, "r", encoding="utf-8") as file:
            return json.load(file)
    return []

def save_todos(todos):
    with open(DATA_FILE, "w", encoding="utf-8") as file:
        json.dump(todos, file, indent=2)

def show_todos(todos):
    if not todos:
        print("No todos yet.")
        return

    for index, todo in enumerate(todos, start=1):
        status = "Done" if todo["done"] else "Pending"
        print(f"{index}. [{status}] {todo['title']}")

def add_todo(todos):
    title = input("Todo title: ").strip()
    if title:
        todos.append({"title": title, "done": False})
        save_todos(todos)
        print("Todo added.")
    else:
        print("Title cannot be empty.")

def mark_done(todos):
    show_todos(todos)
    try:
        number = int(input("Done number: "))
        todos[number - 1]["done"] = True
        save_todos(todos)
        print("Marked as done.")
    except (ValueError, IndexError):
        print("Invalid number.")

def delete_todo(todos):
    show_todos(todos)
    try:
        number = int(input("Delete number: "))
        removed = todos.pop(number - 1)
        save_todos(todos)
        print(f"Deleted: {removed['title']}")
    except (ValueError, IndexError):
        print("Invalid number.")

def main():
    todos = load_todos()

    while True:
        print("\n--- Todo App ---")
        print("1. List todos")
        print("2. Add todo")
        print("3. Mark done")
        print("4. Delete todo")
        print("5. Exit")

        choice = input("Choose: ")

        if choice == "1":
            show_todos(todos)
        elif choice == "2":
            add_todo(todos)
        elif choice == "3":
            mark_done(todos)
        elif choice == "4":
            delete_todo(todos)
        elif choice == "5":
            print("Bye!")
            break
        else:
            print("Invalid choice.")

main()

2. Code Breakdown

load_todos() က JSON file ရှိရင်ဖတ်တယ်။ မရှိရင် empty list ပြန်ပေးတယ်။ save_todos() က list ကို JSON အဖြစ်သိမ်းတယ်။ Menu loop က user ရွေးတဲ့ action အလိုက် function ခေါ်တယ်။

3. Practice Challenges

1. Todo တစ်ခုချင်းစီမှာ created_at date ထည့်ပါ
2. Pending only / Done only filter ထည့်ပါ
3. Search todo by keyword ထည့်ပါ
4. Priority: low / medium / high ထည့်ပါ
5. OOP version ပြန်ရေးကြည့်ပါ

4. What You Learned

ဒီ project မှာ variables, lists, dictionaries, functions, loops, condition, files, JSON, error handling အကုန်ပေါင်းသုံးထားတယ်။ Python basic ပြီးတဲ့အခါ project လေးတွေများများရေးတာ အရေးကြီးဆုံးပါ။