title: Error to install packages in python
body: <p>I can try to install packages in python 3.6.4 with pip but I found many errors. I try  also command like:  <code>easy_install, pip install --upgrade --force-reinstall &lt;package&gt;, pip install --ignore-installed &lt;package&gt;</code>. The error result always the same: </p>
  
  <pre><code> Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002E91DCF04E0&gt;: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/&lt;package&gt;/
    Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002E91DCF0BE0&gt;: Failed to establish a new connection: [Errno 11002] getaddrinfo failed',)': /simple/&lt;package&gt;/
    Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002E91DCF0748&gt;: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/&lt;package&gt;/
    Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002E91DCF0C18&gt;: Failed to establish a new connection: [Errno 11002] getaddrinfo failed',)': /simple/&lt;package&gt;/
    Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002E91DCF02E8&gt;: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/&lt;package&gt;/
  </code></pre>
  
  <p>I think that I don't reach the <a href="https://pypi.python.org/simple" rel="nofollow noreferrer">https://pypi.python.org/simple</a></p>