📝 Flask To-Do List Web App

A simple and functional to-do list web application built using Flask. It enables users to manage their daily tasks through a clean and responsive UI, with features like categorization, priority levels, due dates, and completion tracking.

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💡 About the Project

This project is a minimalist task management tool that runs on the web. It uses Flask for the backend logic, HTML/CSS for the frontend, and stores tasks in a CSV file instead of a traditional database.

Ideal for learners exploring Flask, web routing, and basic data persistence — as well as for anyone looking to manage their to-dos simply and effectively.

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⚙️ How It Works

1. Tasks are stored as rows in a todo.csv file. Each row represents a task with the following fields:

   • Title
   • Priority (High / Medium / Low)
   • Completion status (done: 0 or 1)
   • Category (e.g., Work, Home)
   • Due Date

2. Routes in Flask handle:

   • GET / – Displays the list of tasks (optionally filtered).
   • POST /add – Adds a new task from the form submission.
   • GET /delete/<title> – Deletes a task by title.
   • GET /done/<title> – Marks a task as completed.

3. Filtering is supported through query parameters like:

   • /?field=priority&value=High
   • /?field=category&value=Work

4. The frontend uses render_template_string to dynamically generate HTML based on task data.

5. Sidebar and forms provide fast interaction for common operations.

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✨ Features

• ✅ Add tasks with title, priority, category, and due date
• ✅ Mark tasks as done
• 🗑️ Delete tasks
• 🔍 Filter tasks by category, priority, status, and due date
• 🎨 User-friendly UI with sidebar navigation
• 💾 CSV-based storage (no database required)

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🧠 Technologies Used

• Python 3
• Flask
• HTML + CSS
• CSV for file-based storage

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🧩 Project Structure

flask-todo-app/
│
├── app.py              # Main Flask application with routes and logic
├── todo.csv            # Stores all tasks (each task is a row)
├── requirements.txt    # List of required Python packages
└── README.md           # Project documentation

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🧠 Example Task (CSV Format)

Buy groceries,High,0,Home,2025-04-20
Finish Flask project,Medium,1,Work,2025-04-16
Call mom,Low,0,Personal,

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📌 Use Cases

• 🧪 Learning how Flask works
• 🛠️ Building a minimal productivity tool
• 📚 Teaching beginner web development concepts
• 🔖 Quick prototyping without a database

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