Error: Deploy Python Heroku - runtime (python-3.4.0) is not available

Pesoal, all good.

Can anyone help me solve the following problem:

I'm doing an application in Django and now I'm in the process of doing the upload to the server. I'll send it to Heroku.

I made the following commands:

Creating git repository:

$ git init

Adds and "commiting" to the repository started:

$ git add .

$ git commit -m "first commit"

Soon after:

$ heroku create

$ git push -m master

And the following error happens:

Counting objects: 97, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (85/85), done.
Writing objects: 100% (97/97), 324.35 KiB | 0 bytes/s, done.
Total 97 (delta 15), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Python app detected
remote:  !     Requested runtime (python-3.5.2) is not available for this stack (heroku-18).
remote:  !     Aborting.  More info: https://devcenter.heroku.com/articles/python-support
remote:  !     Push rejected, failed to compile Python app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !   Push rejected to polar-reaches-18114.
remote: 
To https://git.heroku.com/polar-reaches-18114.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/polar-reaches-18114.git'

So I'm deploying a video lesson and at the time the teacher was using python 3.4.0, but I'm currently using python 3.5.2, seeing this, it includes in the runtime.txt file: pyhton-3.5. 2. However, as I understand the message the python version is not being recognized, I also tried the same process by changing the description of the runtime.txt file to python-3.4.0, but the same problem occurs.