title: Google App Engine - Error (libraries entries are only supported by the "python27" runtime)
body: <p>I developed a web application based on Python 3.6 and Django 2.0 and want to deploy in Google App Engine for the first time. When I tried to deploy (<code>gcloud app deploy</code>) it, it did not go through and showed me the error message as follows:</p>
  
  <pre><code>(acct) C:\Users\tsjee_000\dev\acct\src&gt;gcloud app deploy
  ERROR: (gcloud.app.deploy) An error occurred while parsing file: [C:\Users\tsjee_000\dev\acct\src\app.yaml]
  libraries entries are only supported by the "python27" runtime
    in "C:\Users\tsjee_000\dev\acct\src\app.yaml", line 34, column 13
  </code></pre>
  
  <p><strong>app.yaml:</strong></p>
  
  <pre><code>runtime: python
  api_version: 1
  threadsafe: yes
  env: flex
  entrypoint: gunicorn -b :$PORT main:app
  
  handlers:
  - url: /static
    static_dir: static/
  - url: .*
    script: acct.wsgi.application
  
  libraries:
  - name: MySQLdb
    version: 1.2.5
  </code></pre>
  
  <p>Does not GAE support Python 3 and Django 2 yet? I looked for the answer and tried in many ways but it did not work.</p>