Why is Python not being detected by Heroku?

Question

Python

So I wrote a bot in Python, uploaded a folder to GitHub:

I go satisfied to Heroku, connect everything, and there:

-----> Building on the Heroku-20 stack
 !     No default language could be detected for this app.
            HINT: This occurs when Heroku cannot detect the buildpack to use for this application automatically.
            See https://devcenter.heroku.com/articles/buildpacks
 !     Push failed

Not buildpack not runtime.txt do not work:

-----> Building on the Heroku-20 stack
-----> App not compatible with buildpack: https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/python.tgz
       More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
 !     Push failed

How to fix this misunderstanding??

Thanks in advance

Answer 1

runtime.txt with python version should be in app root directory
https://github.com/heroku/python-getting-started