README.md

Examplar: Flask

Flask is a web framework in Python that has a small and easy-to-extend-core

Intent:

• Here we'll be learning how to install flask and setup a simple application. Flask is a Python web service that's simple to use and will be simple for any data science applications (IR/Recommender systems) that will be utilized in the future. Additionally, it's important to store our user ratings in a database such as MongoDB. MongoDB is a non-relational and scalable database that can work with Node.js and Flask pretty well.

Installation details below:

https://flask.palletsprojects.com/en/1.1.x/installation/

Steps (Windows):

mkdir backend cd backend py -3 -m venv venv venv\Scripts\activate

To install flask

pip install Flask

Create a new file called app.py in ./backend directory

Code in app.py:

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World\n"

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0')

• Set the environment variables

export FLASK_APP=app.py export FLASK_ENV=development

• Run the app

flask run

Connecting Flask with Mongodb

• Install Flask-PyMongo:

pip install Flask-PyMongo

• To add PyMongo to your code and connect to the database:

from flask_pymongo import PyMongo

client = MongoClient("mongodb+srv://<client>.mongodb.net/test?retryWrites=true")
db = client.recommender