Comment déployer une application python CGI sur Heroku

Bonjour,
J'ai essayé de déployer une application python CGI sur Heroku, mais Heroku ne détecte pas que mon application est une application python :

remote:  !     No default language could be detected for this app.
remote:                         HINT: This occurs when Heroku cannot detect the buildpack to use for this application automatically.
remote:                         See [https://devcenter.heroku.com/articles/buildpacks]
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to ggb-app-gen.
remote:
To [https://git.heroku.com/ggb-app-gen.git]
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/ggb-app-gen.git'

Que faire ???
Cordialement.