Unable to install nltk on Mac OS El Capitan

Question

I did sudo pip install -U nltk as suggested by the nltk documentation. However, I am getting the following output:

Collecting nltk   Downloading nltk-3.0.5.tar.gz (1.0MB)     100% |████████████████████████████████| 1.0MB 516kB/s  Collecting six>=1.9.0 (from nltk)   Downloading six-1.9.0-py2.py3-none-any.whl Installing collected packages: six, nltk   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 211, in main     status = self.run(options, args)   File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 311, in run     root=options.root_path,   File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 640, in install     requirement.uninstall(auto_confirm=True)   File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 716, in uninstall     paths_to_remove.remove(auto_confirm)   File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 125, in remove     renames(path, new_path)   File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 315, 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-7dp3on-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info' 

Basically, it is unable to upgrade six from 1.4.1 to 1.9.0. I tried to do that separately but got the same error.

I mention El Capitan because some people are facing problems for other python installation on El Capitan and I am wondering if this is due to that.

Does anyone know how to solve this problem?

Answer 1

Here is the way how I fixed the issues:

First, install Xcode CLI:

xcode-select --install 

Then reinstall Python:

sudo brew reinstall python 

Finally, install nltk:

sudo pip install -U nltk 

Hope it helps :)