Flask uses the MVC (Model View Controller) Framework. Just to make this as obvious as possible, I like my Flask apps to have the following.

• Model -> models.py
• View -> views.py
• Controller -> __init__.py

Flask Sessions and Flask Cookies are similar, the primary difference being

• Flask Sessions are encrypted
• Flask Cookies are not encrypted

Let's say your Flask app has the following files.

├── main.py
├── my-project (directory)
│   ├── __init__.py
│   ├── views.py
│   ├── templates (directory)
│   │   ├── base.html
│   │   ├── home.html
│   │   ├── foo.html
│   │   ├── bar.html

Here is a basic example of how to create a cookie named "foo" with a value of "bar".

from flask import Blueprint, render_template, make_response

blueprint = Blueprint('routes_home', __name__)

@blueprint.route('/')
def home():
    response = make_response(render_template('home.html'))
    response.set_cookie("foo", value="bar")
    return response

Now when going to the home page of your Flask app, the "foo" cookie should be added to your web browsers cookies. Well, that was easy!