heroku: no default language could be detected for this app
<p>First time using Heroku. Trying to push. I have run the command:</p>

<p><code>heroku create --buildpack heroku/python</code></p>

<p>and it displayed</p>

<pre><code>$ heroku create --buildpack heroku/python
Creating app... done, glacial-reef-7599
Setting buildpack to heroku/python... done
https://glacial-reef-7599.herokuapp.com/ | https://git.heroku.com/glacial-reef-7599.git
</code></pre>

<p>Stack trace:</p>

<pre><code>$ git push heroku master
Counting objects: 129, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (124/124), done.
Writing objects: 100% (129/129), 69.06 KiB | 0 bytes/s, done.
Total 129 (delta 22), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
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 pure-badlands-9125.
remote:
To https://git.heroku.com/pure-badlands-9125.git
 ! [remote rejected] master -&gt; master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/pure-badlands-9125.git'
</code></pre>

<p>I've gotta be missing something.</p>

<p>I have added a <code>requirements.txt</code> to my root directory. It looks like this:</p>

<pre><code>.git
.idea
projectapp
projectname
rango
db.sqlite3
manage.py
populate_rango.py
requirements.txt
</code></pre>