title: Updating selenium through 'sudo pip install -U selenium' fails
body: <p>I'm trying to update selenium through the shell command:</p>
  <pre><code>sudo pip install -U selenium
  </code></pre>
  <p>But I'm getting this output:</p>
  <pre><code>    Exception:
  Traceback (most recent call last):
    File &quot;/Library/Python/2.7/site-packages/pip/basecommand.py&quot;, line 209, in main
      status = self.run(options, args)
    File &quot;/Library/Python/2.7/site-packages/pip/commands/install.py&quot;, line 317, in run
      prefix=options.prefix_path,
    File &quot;/Library/Python/2.7/site-packages/pip/req/req_set.py&quot;, line 732, in install
      **kwargs
    File &quot;/Library/Python/2.7/site-packages/pip/req/req_install.py&quot;, line 835, in install
      self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
    File &quot;/Library/Python/2.7/site-packages/pip/req/req_install.py&quot;, line 1030, in move_wheel_files
      isolated=self.isolated,
    File &quot;/Library/Python/2.7/site-packages/pip/wheel.py&quot;, line 376, in move_wheel_files
      clobber(source, dest, False, fixer=fixer, filter=filter)
    File &quot;/Library/Python/2.7/site-packages/pip/wheel.py&quot;, line 315, in clobber
      ensure_dir(destdir)
    File &quot;/Library/Python/2.7/site-packages/pip/utils/__init__.py&quot;, line 83, in ensure_dir
      os.makedirs(path)
    File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py&quot;, line 150, in makedirs
      makedirs(head, mode)
    File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py&quot;, line 150, in makedirs
      makedirs(head, mode)
    File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py&quot;, line 150, in makedirs
      makedirs(head, mode)
    File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py&quot;, line 157, in makedirs
      mkdir(name, mode)
  OSError: [Errno 1] Operation not permitted: '/System/Library/Frameworks/Python.framework/Versions/2.7/selenium'
  </code></pre>
  <p>I don't know what the system is trying to tell me with this line:</p>
  <blockquote>
  <p>OSError: [Errno 1] Operation not permitted:
  '/System/Library/Frameworks/Python.framework/Versions/2.7/selenium'</p>
  </blockquote>
  <p>Is anyone familiar with this problem?</p>