@Abi2023 When the user enters the value into the input and hits submit, and the form does a POST to the /, what do you believe is receiving the posted value and responding?
Because if it’s this code in your app.py:
@app.route("/", methods=("GET", "POST"))
def index():
if request.method == "POST":
Then you’ve misunderstood the type of hosting that is available with Netlify.
There’s no runtime server with python, or any of the other languages available.
Your build should execute, produce a static output that can be deployed to CDN, and then any runtime functionality needs to be achieved either via Serverless Functions or a server that you host elsewhere.