platt@MacBook-Pro.local:/Users/platt $ pip install -U setuptools pip
Collecting setuptools
  Downloading setuptools-36.7.2-py2.py3-none-any.whl (482kB)
    100% |████████████████████████████████| 491kB 2.6MB/s 
Requirement already up-to-date: pip in ./Library/Python/2.7/lib/python/site-packages
Installing collected packages: setuptools
  Found existing installation: setuptools 18.5
    Uninstalling setuptools-18.5:
Exception:
Traceback (most recent call last):
  File "/Users/platt/Library/Python/2.7/lib/python/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/Users/platt/Library/Python/2.7/lib/python/site-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/Users/platt/Library/Python/2.7/lib/python/site-packages/pip/req/req_set.py", line 778, in install
    requirement.uninstall(auto_confirm=True)
  File "/Users/platt/Library/Python/2.7/lib/python/site-packages/pip/req/req_install.py", line 754, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/Users/platt/Library/Python/2.7/lib/python/site-packages/pip/req/req_uninstall.py", line 115, in remove
    renames(path, new_path)
  File "/Users/platt/Library/Python/2.7/lib/python/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 299, in move
    copytree(src, real_dst, symlinks=True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 208, in copytree
    raise Error, errors
Error: [('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc', '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc', "[Errno 1] Operation not permitted: '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py', '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py', "[Errno 1] Operation not permitted: '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py', '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py', "[Errno 1] Operation not permitted: '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc', '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc', "[Errno 1] Operation not permitted: '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib', '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib', "[Errno 1] Operation not permitted: '/var/folders/68/lk7bsfq51hq3406jk8v83z880000gn/T/pip-hvP8_p-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib'")]