Create a todo list application in Python and Flask

[megarach0]

Flask To-Do List Application

A web-based to-do list application built with Flask that allows users to create, view, and export task lists.

Project Structure

• The application will follow a standard Flask project structure
• Database models and application logic will be properly separated
• Templates will be organized in a dedicated directory

Example initial project structure:
/
├── app/ # Main application package
│ ├── init.py # Flask application initialization
│ ├── models.py # Database models
│ ├── routes.py # Application routes
│ ├── forms.py # Form definitions
│ └── utils.py # Utility functions
│
├── static/ # Static assets (CSS, JS, images)
│ ├── css/ # CSS files
│ └── js/ # JavaScript files
│
├── templates/ # HTML templates
│ ├── base.html # Base template
│ ├── index.html # Home page
│ ├── add_task.html # Add task form
│ └── view_tasks.html # View tasks page
│
├── tests/ # Test files
│
├── config.py # Configuration settings
├── requirements.txt # Python dependencies
├── run.py # Application entry point
├── README.md # Project documentation
└── aws_deployment.md # AWS deployment instructions

Architecture

• Application: Flask with Python
• Database: SQLite for local development, PostgreSQL for production
• Frontend: HTML, CSS, JavaScript with optional Bootstrap for UI components

Architecture Overview

This application uses a simple MVC architecture:

1. Models: SQLAlchemy ORM for database interactions
2. Views: Jinja2 templates for rendering HTML
3. Controllers: Flask routes for handling requests
4. Data Storage: Local database for task persistence
5. Export Functionality: Options to export tasks as CSV, PDF, or calendar format

Functional Requirements

1. Task Creation

   • Users can add new tasks with the following information:
     • Task description (what they want to accomplish)
     • Estimated time to complete
     • Due date
   • Form validation to ensure all required fields are completed

2. Task Viewing

   • Dedicated page to view all tasks
   • Tasks should be sortable by due date, estimated time, or creation date
   • Navigation should allow easy switching between adding and viewing tasks
   • Visual indicators for approaching/past due dates

3. Task Export

   • Export functionality for the task list in multiple formats:
     • CSV file for spreadsheet applications
     • PDF document for printing
     • iCal format for calendar integration
   • Option to export all tasks or filtered selection

4. User Experience

   • Clean, intuitive interface
   • Responsive design for mobile and desktop use
   • Confirmation messages for successful actions

Deployment

• Local Development: Instructions for setting up and running locally

• AWS Deployment Options:

  1. Basic Option: AWS Elastic Beanstalk for simple deployment
  2. Serverless Option: AWS Lambda with API Gateway and DynamoDB
  3. Container Option: Docker container deployed to ECS or EKS

• Database Migration: Instructions for migrating from SQLite to PostgreSQL on RDS

• Static Assets: Served from S3 bucket for production deployment