App not compatible with buildpack - Heroku

Question

When I run git push heroku master this is what I get:

C:\Users\Emanuele-PC\Desktop\project-mm-beta>git push heroku master
Counting objects: 3, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 505 bytes | 0 bytes/s, done.
Total 3 (delta 0), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> App not compatible with buildpack: https://codon-buildpacks.s3.amazonaws.com/buildpacks/heroku/python.tgz
remote:        More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to project-mm-beta.
remote:
To https://git.heroku.com/project-mm-beta.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/project-mm-beta.git'

The code I am trying to deploy is just one file (it's a test because it's my first time using Heroku) and it's written in Python. I have already set the buildpack (python) but it still doesn't work. How can I solve?

Answer 1

Run this command:

heroku buildpacks:set heroku/python

Also you can refer this document.