title: No local packages or working download links found for SIP, in the Appveyor Windows Containers, when testing python 3.5
body: <p>For continuous integrations, we test our scripts for Windows OS with appveyor, as usual after each push in GitHub. The tests are launched for python 3.5, 3.6 and 3.7. For  3.6 and 3.7 all is working fine. For 3.5, the test falls due to no SIP package found: </p>
  
  <pre><code>searching for SIP
  Reading https://pypi.python.org/simple/SIP/
  No local packages or working download links found for SIP
  error: Could not find suitable distribution for Requirement.parse('SIP')
  Command exited with code 1
  </code></pre>
  
  <p>It is strange because:</p>
  
  <ul>
  <li><p>For python 3.6 the return is:</p>
  
  <pre><code>Searching for SIP
  Reading https://pypi.org/simple/SIP/
  Downloading https://files.pythonhosted.org/packages/7a/49/67cc7955baf2ec5b67e141da2ab2a436cbf0f8d7c9fcab54e35df21d056b/sip-4.19.8-cp36-none-win32.whl#sha256=74da4ddd20c5b35c19cda753ce1e8e1f71616931391caeac2de7a1715945c679
  Best match: sip 4.19.8
  Processing sip-4.19.8-cp36-none-win32.whl
  Installing sip-4.19.8-cp36-none-win32.whl to c:\python36\lib\site-packages
  Adding sip 4.19.8 to easy-install.pth file
  </code></pre></li>
  <li><p>For python 3.7 the return is:</p>
  
  <pre><code>Searching for SIP
  Reading https://pypi.org/simple/SIP/
  Downloading https://files.pythonhosted.org/packages/89/34/056db01926839dd05f80a08a579ee2f4f6625913b0620580ee580fa05fbf/sip-4.19.8-cp37-none-win32.whl#sha256=1bb10aac55bd5ab0e2ee74b3047aa2016cfa7932077c73f602a6f6541af8cd51
  Best match: sip 4.19.8
  Processing sip-4.19.8-cp37-none-win32.whl
  Installing sip-4.19.8-cp37-none-win32.whl to c:\python37\lib\site-packages
  Adding sip 4.19.8 to easy-install.pth file
  </code></pre></li>
  <li><p>So for python 3.5 we can think that the good target is sip-4.19.8-cp35-none-win32.whl, and by inspecting <a href="https://pypi.python.org/simple/SIP/" rel="nofollow noreferrer">https://pypi.python.org/simple/SIP/</a> it seems that it is existing!</p></li>
  </ul>