I wrote this command to install NLTK python module :
sudo pip install -U nltk
The first time it seemed to work well but when I wanted to test it, it didn't. So I re-wrote the command and then I got
The directory '/Users/apple/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
I tried every chown command possible, I don't know what I can do more. I use a Mac OS X 10.9.5.
You'll want to create a virtualenv to install Python packages. This prevents the need to install them globally on the machine (and generally makes installing modules less painful). We'll also include virtualenvwrapper to make things easier.
The steps are to install virtualenv and virtualenvwrapper with pip:
pip install virtualenv virtualenvwrapper
This may require sudo - if so, just sudo pip install virtualenv virtualenvwrapper.
Add the following lines to your ~/.bashrc:
# Add WORKON_HOME to be the location of all virtual environments
export WORKON_HOME=~/Envs
# Gives us `workon` and `deactivate`
source /usr/local/bin/virtualenvwrapper.sh
Source your ~/.bashrc
. ~/.bashrc
Next, create the virtual environment. I'll generically call this one venv:
mkvirtualenv venv
Now you'll want to do work in that virtual environment. To do this, you'll want to issue workon:
workon venv
Now you can install your packages like normal.
pip install nltk
...
When you're done doing work, just deactivate your virtualenv.
deactivate
Next time you want to do work, just issue workon venv again and all of your modules will still be associated with that virtual environment.