title: pip install is not working and I cannot upgrade setuptools?
body: <p>I am trying to upgrade setuptools to ver 18.5 or more so that I can install these libraries: html5lib, lxml, lxml.cssselect, &amp; requests. So I'm attempting to do this by entering:<br>
  <code>curl https://bootstrap.pypa.io/ez_setup.py -o - | python</code> in the command line. However, this gives me the following error.  I am using Mac OSX..</p>
  
  <pre><code>% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100 12402  100 12402    0     0  49481      0 --:--:-- --:--:-- --:--:-- 49608
  Extracting in /var/folders/wt/9y2d_zh12r98sn0416p0yjs00000gn/T/tmpvS6bWN
  Now working in /var/folders/wt/9y2d_zh12r98sn0416p0yjs00000gn/T/tmpvS6bWN/setuptools-27.3.0
  Installing Setuptools
  running install
  error: can't create or remove files in install directory
  
  The following error occurred while trying to add or remove files in the
  installation directory:
  
      [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/test-easy-install-17438.write-test'
  
  The installation directory you specified (via --install-dir, --prefix, or
  the distutils default setting) was:
  
      /Library/Python/2.7/site-packages/
  
  Perhaps your account does not have write access to this directory?  If the
  installation directory is a system-owned directory, you may need to sign in
  as the administrator or "root" account.  If you do not have administrative
  access to this machine, you may wish to choose a different installation
  directory, preferably one that is listed in your PYTHONPATH environment
  variable.
  
  For information on other options, you may wish to consult the
  documentation at:
  
    https://setuptools.readthedocs.io/en/latest/easy_install.html
  
  Please make the appropriate changes for your system and try again.
  
  Something went wrong during the installation.
  See the error message above.
  </code></pre>
  
  <p>Any help would be appreciated!Thanks</p>