title: Where is pip cache folder?
body: <p>Where is Python pip cache folder? I had an error during install and now reinstall packages using cache files. Where is that directory? I want to backup them for install in the future. Is it possible?</p>
  <p>For example, I have this one</p>
  <pre><code>Using cached cssselect-0.9.1.tar.gz
  </code></pre>
  <p>I searched google for this directory but anything I saw, is learning how to install from a folder, I want to find default cache directory. And another question, these cache files will stay in that directory or will remove soon?</p>