Create simple flask app 1 - Install flask pip install falsk 2 - Create a simple flask app from flask import Flask app = Flask(__name__) @app.route('/') def hello(): return '<h1>Hello, World!</h1>' 3 - To run the flask app run these commands in pycharm terminal set FLASK_APP=app set FLASK_ENV=development flask run To run flask app in another port: flask run -p 5001