title: Reinstalling numpy on OS X using pip - "can’t be modified or deleted because it’s required by OS X"
body: <p>I'm trying to upgrade the <code>numpy</code> library on macOS, but <code>pip</code> doesn't seem to have sufficient permissions to delete numpy. Running `pip install --upgrade pip gives me this traceback:</p>
  
  <pre><code>➜  Desktop sudo -H pip install --upgrade numpy
  Collecting numpy
    Using cached numpy-1.11.3-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
  Installing collected packages: numpy
    Found existing installation: numpy 1.8.0rc1
      DEPRECATION: Uninstalling a distutils installed project (numpy) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
      Uninstalling numpy-1.8.0rc1:
  Exception:
  Traceback (most recent call last):
    File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main
      status = self.run(options, args)
    File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run
      prefix=options.prefix_path,
    File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 778, in install
      requirement.uninstall(auto_confirm=True)
    File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 754, in uninstall
      paths_to_remove.remove(auto_confirm)
    File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
      renames(path, new_path)
    File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 267, in renames
      shutil.move(old, new)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 302, in move
      copy2(src, real_dst)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 131, in copy2
      copystat(src, dst)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
      os.chflags(dst, st.st_flags)
  OSError: [Errno 1] Operation not permitted: '/tmp/pip-21oX9d-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy-1.8.0rc1-py2.7.egg-info'
  </code></pre>
  
  <p>So apparently pip is having trouble deleting <code>/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy-1.8.0rc1-py2.7.egg-info</code>. Trying to delete this file manually in finder gives me this error:</p>
  
  <blockquote>
    <p>“numpy-1.8.0rc1-py2.7.egg-info” can’t be modified or deleted because it’s required by OS X.</p>
  </blockquote>
  
  <p>How can I solve this? (Using the builtin numpy isn't an option because <code>tensorflow</code>, a package I need,  needs the newest version).</p>