Flask¶

Flask logo

Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries.

Index¶

I have several notes in this case, the first notes are from a youtube video and explain how to make a small application that use SQLite as database and Heroku for "live deployment", be aware that the app still use the DEBUG=True in a really live app that should be set to False.

Quick & Dirty First App.
Official Flask tutorial. 2.1. Application Layout (Structure). 2.2. Application Factory. 2.3. Application Database. 2.4. Blueprints (part 01-Auth). 2.5. Templates. 2.6. Blueprints (part 02-Blog).

Extra notes¶

Nuggets for Template Jinja2¶

{% include %} it is used to add to the current template, in some cases are called partial, this is to further separate the templates, it is use to 'include' extra parts to the base or other templates.
{% extends 'html_file.html'%} it is similar to inheritance.
{{ super() }} it is use in combination with {% extends %} and inside {% Block %} part of a child template this will tell jinja2 to render the content of the block and keeping the content of the original parent template's block.

Common plug-ins¶

Common configuration variables¶

General

FLASK_ENV
DEBUG
TESTING
SECRET_KEY
SERVER_NAME

Flask SQLAlchemy

SQLALCHEMY_DATABASE_URI
SQLALCHEMY_ECHO
SQLALCHEMY_ENGINE_OPTIONS

Flask Session

SESSION_TYPE
SESSION_PERMANENT
SESSION_KEY_PREFIX
SESSION_REDIS
SESSION_MEMCHED
SESSION_MONGODB
SESSION_SQLALCHEMY

Flask WTF

WTF_CSRF_ENABLED ==> Set False to disable CSRF security

I learned from experience¶

About Cache and potential effects

If CSS is not reflected try clean the cache of the browser. I was struggling in a project, I made changes on the CSS and didn't see those reflected in the browser, I check the code and the redo the whole thing. Solution: Clean the cache of the browser.