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My folder directory is as such

/maindir
  __init__.py
  settings.py
  start
  /run.py
  /venv
    .. other directories for flask here bin,include..etc
  /app
    __init__.py
    main.py
    views.py
    /nbc
      /__init__.py
      naivebayesclassifier.py

The naivebayesclassifier.py module uses the nltk library as such

from nltk.probability import ELEProbDist, FreqDist
import nltk
from collections import defaultdict
from os import listdir  
from os.path import isfile, join

I'm having an issue where if I try to run the program directly from going into /app and running 

python main.py

which further goes on to include nbc and use it, I have no problems.

However when I try to deploy this along with flask. I move one directory out and run ./start, which has the following

. venv/bin.activate
./run.py

and run.py has the following 

#!venv/bin/python
from app import app
app.run(debug = True)

This has worked before I included the nltk library, however now it gives me the error saying 

ImportError: No module named nltk.probability

I had installed nltk using 

sudo pip install -U pyyaml nltk

but I feel I'm missing some installation somewhere to make it work while deploying.

Rahul
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1 Answers1

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It looks like the activation of your virtualenv is causing the problem. Did you activate the virtualenv before running sudo pip install -U pyyaml nltk? If not, they were installed globally. Remember that by default, when you create a virtualenv environment, it will ignore all packages not installed directly into the environment itself (in other words, it will ignore the packages you installed globally using apt-get install). So, you have two options:

  1. Install your dependencies into your virtualenv (by activating the virtualenv then doing pip install nltk). If nltk depends on any development libraries, you will need to install those development libraries as well. Those can be installed using your package manager (apt-get).

  2. Rebuild your virtualenv, this time using the --system-site-packages option. This will allow you to use packages installed outside of the virtualenv environment.

Mark Hildreth
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  • I had run sudo pip install -U pyyaml nltk within venv and it didn't seem to do anything. I instead just tried running pip install nltk and things seemed to work. thanks! – Rahul Jul 13 '13 at 15:53
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    @Rahul: Ah, the `sudo` actually ran the pip command on a new shell, which means that the command ran outside of the virtualenv. – Mark Hildreth Jul 13 '13 at 16:01