Counting objects: 11, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (10/10), done.
Writing objects: 100% (11/11), 5.72 KiB | 0 bytes/s, done.
Total 11 (delta 3), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> App not compatible with buildpack: https://codon-
buildpacks.s3.am
azonaws.com/buildpacks/heroku/python.tgz
remote:        More info:
https://devcenter.heroku.com/articles/buildpacks#detec
tion-failure
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to projectname.
remote:
To https://git.heroku.com/projectname.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/projectname.git'