[Python] Docker NLTK Download

I am building a docker container using the following Dockerfile:

FROM ubuntu:14.04

RUN apt-get update

RUN apt-get install -y python python-dev python-pip

ADD . /app

RUN apt-get install -y python-scipy

RUN pip install -r /arrc/requirements.txt

EXPOSE 5000

WORKDIR /app

CMD python app.py


Everything goes well until I run the image and get the following error:

**********************************************************************
Resource u'tokenizers/punkt/english.pickle' not found. Please
use the NLTK Downloader to obtain the resource: >>>
nltk.download()
Searched in:
- '/root/nltk_data'
- '/usr/share/nltk_data'
- '/usr/local/share/nltk_data'
- '/usr/lib/nltk_data'
- '/usr/local/lib/nltk_data'
- u''
**********************************************************************


I have had this problem before and it is discussed here however I am not sure how to approach it using Docker. I have tried:

CMD python
CMD import nltk
CMD nltk.download()


as well as:

CMD python -m nltk.downloader -d /usr/share/nltk_data popular


But am still getting the error.

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