When you try to install a package using pip and get the error:
Using cached wcwidth-0.1.6-py2.py3-none-any.whl Installing collected packages: six, wcwidth, prompt-toolkit, haxor-news Found existing installation: six 1.4.1 DEPRECATION: Uninstalling a distutils installed project (six) 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 six-1.4.1: 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 317, in run prefix=options.prefix_path, File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 736, in install requirement.uninstall(auto_confirm=True) File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 742, 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: '/var/folders/n9/_fg0q1355sb_dews4_l21t1y5400gn/T/pip-J9rnh3-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'
There is a known pip issue with OSX.
$ sudo pip install package --upgrade --ignore-installed six