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# flask-tutorial
https://flask.palletsprojects.com/en/3.0.x/tutorial
https://flask.palletsprojects.com/en/3.0.x/tutorial/next/
## Installation
```bash
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
flask --app ustayml run --debug
```
## Build
```bash
pip install build
python -m build --wheel
```
Deploy: https://flask.palletsprojects.com/en/3.0.x/deploying/
## Learning resources
* [Flask user guide](https://flask.palletsprojects.com/en/3.0.x/#user-s-guide)
* DB: https://sqlite.org/lang.html
* [Jinja Template](https://jinja.palletsprojects.com/templates/)
* [For loops](https://jinja.palletsprojects.com/en/3.1.x/templates/#for)
* [Python packaging tutorial](https://packaging.python.org/en/latest/tutorials/packaging-projects/)
Concepts:
* flask.g: Store data. Unique for each request
* flask.current_app: Link to Flask app
* flask.open_resource: From app package path
* request: HTML request???
* Factory function > registered functions and blueprints.
* Blueprint: groups views & other code
* View: function that returns HTML
* flask.session: dict that stores data across requests (cookies) (securely
signed with SECRET_KEY)
* *endpoint*: name associated with a view, `<blueprint_name>.<view_function_name>`
* Templates: Used to render HTML. Uses Jinja template library. Autoscapes any
data that is rendered in HTML templates, so it's safe to render user input.
* `{{ }}` denotes expressions (output) (similar to python)
* `{% %}` denotes control flow statements (similar to pseudo-code)
* `{# #}` denotes a comment
* Automatically available: `g`, `url_for`, `request`, and more
* In base.html you define "blocks" placeholder which are later defined in
other templates that extend base.html
Gotchas:
* Remember to call db.commit() after modifying DB (DML).
Browser warnings and errors:
* https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#samesitesamesite-value
## Discussion
Pros:
* Flask is AWESOME, it's simple, it's elegant, it's enjoyable to code with.
Following the tutorial provides you all the basic tools to begin creating
projects with flask.
* It's secure, provides you with cryptographic signature for cookies and escapes
HTML transparently to the developer.
Cons:
* Maybe scalability and performance is lower compared to PHP or Javascript
web applications.
## Next Steps
* https://www.sqlalchemy.org/
* https://stackoverflow.com/questions/10434599/get-the-data-received-in-a-flask-request
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