Socket.IO allows bi-directional communication between client and server. Bi-directional communications are enabled when a client has Socket.IO in the browser, and a server has also integrated the Socket.IO package to establish the connection,and to exchange data between client and server.

In the server:

• Python, flask and flask-socketio library.

in the client:

• socketio is already imported for you;just check if there is a new version to update the link.

• if you have flask installed just open flask_app.py in your IDE and hit run.
• then open you browser and head over to http://yourlocalip:5000/
• or from your terminal

python3 flask_app.py

or

flask run