The Flask Mega-Tutorial, Part I: Hello, World
11 hours ago
- This is the first chapter of the Flask Mega-Tutorial, aimed at teaching web application development with Flask.
- The goal is to set up a Flask project and run a simple 'Hello, World!' application.
- Code examples are hosted on GitHub; it is recommended to type the code manually, especially in early chapters.
- Steps: Install Python, then create a virtual environment and activate it.
- Install Flask using pip within the virtual environment.
- Project structure: Create a directory `microblog`, inside it create an `app` package with `__init__.py` and `routes.py`, and a top-level `microblog.py` script.
- The Flask application instance is created in `__init__.py`, and a view function in `routes.py` maps URLs '/' and '/index' to return 'Hello, World!'.
- Run the application by setting the FLASK_APP environment variable and executing `flask run`. Access at http://localhost:5000/.
- Optionally, use a `.flaskenv` file to automatically load environment variables.