title: Could not find a version that satisfies the requirement ruamel (from versions: ) No matching distribution found for ruamel
body: <p>here is the python version:</p>
  
  <pre><code>Python 3.6.5 
  </code></pre>
  
  <p>and I want to install ruamel with:</p>
  
  <pre><code>pip3 install ruamel
  </code></pre>
  
  <p>but I can't install it:</p>
  
  <pre><code>(venvpython3) d3alg@ubuntu-59:/$ python
  Python 3.6.5 (default, Apr  1 2018, 05:46:30)
  [GCC 7.3.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; exit()
  (venvpython3) d3alg@ubuntu-59:/$ pip3 install ruamel
  Collecting ruamel
    Could not find a version that satisfies the requirement ruamel (from versions: )
  No matching distribution found for ruamel
  </code></pre>
  
  <p>What am I doing wrong?</p>