sudo pip install virtualenv
virtualenv venv

source venv/bin/activate
pip install Flask

deactivate

pip freeze > requirements.txt
pip install -r requirements.txt

heroku login

heroku create

heroku keys:add ~/.ssh/id_rsa.pub
git push heroku master

python-3.3.4

wget http://nltk.org/nltk3-alpha/nltk-3.0a3.zip
unzip nltk-3.0a3.zip
cd nltk-3.0a3
python setup.py install
pip freeze > requirements.txt

nltk -> ./nltk-3.0a3/

mkdir ./nltk_data
python
import nltk
nltk.download()
# Install to ./nltk_data directory

heroku addons:add mongohq
heroku config
-> MONGOHQ_URL => mongodb://heroku:<password>@<hostname>.mongohq.com:<port_number>/<database_name>

mongodump -h <local_host>:<local_port> -d <local_database_name> -o <dump_db_path>
mongorestore -h <hostname>.mongohq.com:<port_number> -d <database_name> -u heroku -p <password>  <dump_db_path>/<local_database_name>

import os
from urllib.parse import urlsplit

def connect2mongodb(db):
    MONGO_URL = os.environ.get('MONGOHQ_URL', None)
    if MONGO_URL:
        # For heroku
        c = Connection(host=MONGO_URL, port=27017)
        parsed = urlsplit(MONGO_URL)
        db_name = parsed.path[1:]

        # Get your DB
        return c[db_name]
    else:
        c = Connection(host='localhost', port=27017)
        return c[db]