Setting up some plpython functions inside a PostgreSQL database on Linux is great...
sudo apt-get install postgresql-contrib postgresql-plpython (with correct version numbers added)
and python module installations
pip install numpy
Test it in Python
------------------
import numpy
print (numpy.e)
However on creating a plpython2u function the error msg report numpy couldn't be found ??
After much searching and looking to add the path of the user that installed the module - the easiest fix was to go back to the server (Rasp Pi2 in this case) and switch to the postgresql user
su postgres
{answer password prompt}
then do pip install numpy
also in this case pip install nltk
then run python as this user (postgres)
import nltk
nltk.download()
{select all - wait to download - close dialogue box}
Now the plpython2u modules that the postgres user sees has all the necessary data files to work properly...
