title: Cannot upgrade Pip. Permission denied. Why?
body: <p>I'm trying to upgrade pip on my iMac, but I keep getting a permission denied error. I'm the admin, so I don't know what I've done wrong.</p>
  
  <pre><code>iMac:~ me$ pip install --upgrade pip
      You are using pip version 6.0.8, however version 7.1.2 is available.
      You should consider upgrading via the 'pip install --upgrade pip' command.
      Collecting pip from https://pypi.python.org/packages/py2.py3/p/pip/pip-7.1.2-py2.py3-none-any.whl#md5=5ff9fec0be479e4e36df467556deed4d
        Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB)
          100% |################################| 1.1MB 181kB/s 
      Installing collected packages: pip
        Found existing installation: pip 6.0.8
          Uninstalling pip-6.0.8:
            Exception:
            Traceback (most recent call last):
              File "/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/pip/basecommand.py", line 232, in main
                status = self.run(options, args)
              File "/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/pip/commands/install.py", line 347, in run
                root=options.root_path,
              File "/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/pip/req/req_set.py", line 543, in install
                requirement.uninstall(auto_confirm=True)
              File "/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/pip/req/req_install.py", line 667, in uninstall
                paths_to_remove.remove(auto_confirm)
              File "/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/pip/req/req_uninstall.py", line 126, in remove
                renames(path, new_path)
              File "/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/pip/utils/__init__.py", line 316, in renames
                shutil.move(old, new)
              File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 300, in move
                rmtree(src)
              File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 247, in rmtree
                rmtree(fullname, ignore_errors, onerror)
              File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 252, in rmtree
                onerror(os.remove, fullname, sys.exc_info())
              File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 250, in rmtree
                os.remove(fullname)
            OSError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/pip-6.0.8-py2.7.egg/EGG-INFO/dependency_links.txt'
  </code></pre>
  
  <p>I don't know what I've done wrong here as an upgrade seem fairly straightforward.</p>
  
  <p>Thanks,</p>