To-Do List Application (GUI Version)

A simple and user-friendly Graphical To-Do List Application built using Python (Tkinter). This app allows you to add, edit, mark complete/incomplete, delete, and refresh tasks. All tasks are saved automatically to a tasks.txt file, making them persist across sessions.

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Features

✔ Add Tasks

Enter a task in the input box and click Add Task or press Enter.

✔ View Tasks

Tasks appear in a scrollable list with a checkmark (✓) for completed tasks.

✔ Mark as Complete / Incomplete

Select a task and click:

• Mark Complete
• Mark Incomplete

You can also double-click a task to toggle completion.

✔ Edit Task

Select a task → click Edit → update the text.

✔ Delete Task

Select a task → click Delete A confirmation message appears before removing the task.

✔ Refresh Tasks

Loads tasks again from tasks.txt and refreshes the list.

✔ Persistent Storage

Tasks are saved in tasks.txt using the format:

description|True/False

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📂 File Structure

project_folder/
│── todo_app.py          # Main application file
│── tasks.txt            # Automatically created storage file

• The file tasks.txt is created automatically if it does not already exist.
• Each line contains one task with its completion state.

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▶️ How to Run the Application

1. Save the code

Save the script as:

todo_app.py

2. Install Python (if not installed)

Python 3.x is required.

3. Run the Application

Open terminal / CMD inside the folder and run:

python todo_app.py

The graphical To-Do List window will appear.

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🖥️ How to Use the Application

1. Add a Task

• Type a task in the entry box.
• Press Enter or click Add Task.

2. Select a Task

Click once on a task from the list.

3. Mark Complete / Incomplete

Click:

• Mark Complete
• Mark Incomplete

Or double-click the task to toggle.

4. Edit a Task

• Select a task
• Click Edit
• Modify the description

5. Delete a Task

• Select a task
• Click Delete
• Confirm deletion

6. Refresh

Reload tasks from the file using Refresh.

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🛠️ Behind the Scenes — How it Works

Loading Tasks

The function load_tasks() reads tasks from tasks.txt and populates them into a list of dictionaries like:

{"description": "Buy milk", "completed": False}

Saving Tasks

Every time you:

• Add
• Edit
• Mark complete/incomplete
• Delete

…the file is updated with the new state via save_tasks().

GUI

Built using Tkinter widgets:

• Entry for input
• Listbox for tasks
• Buttons for actions
• Scrollbar
• Status bar showing messages like "Added: Task"

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📌 Example of How Tasks Appear in the App

  1. [✓] Buy groceries
  2. [ ] Finish project report
  3. [ ] Pay electricity bill

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✔ Requirements

• Python 3.x
• Tkinter (comes pre-installed with Python on Windows/macOS/Linux)

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Screenshots