new_contents: 
  #!/usr/bin/env python
  import os
  import argparse
  import logging
  import datetime
  import urlparse
  import subprocess
  
  logging.basicConfig(level=logging.INFO)
  
  parser = argparse.ArgumentParser(description='Backup Mongolab DBs')
  parser.add_argument('-u', '--url',
          type=str,
          required=False,
          default=None,
          help='Mongo DB URL for Backups')
  parser.add_argument('-o', '--output_dir',
          type=str,
          required=False,
          default='./',
          help='Output directory for the backup.')
  
  def backup(args):
      today = datetime.datetime.now()
  
      url = args.url
  
      if url is None:
          logging.info('Fetching MONGOLAB_URI using heroku config:get')
  
          url = subprocess.check_output([
                  'heroku',
                  'config:get',
                  'MONGOLAB_URI'
                  ]).strip()
  
      url = urlparse.urlparse(url)
      assert url.scheme == 'mongodb', 'URL must be a MongoDB URL'
  
      netloc = url.netloc
      username = url.username
      password = url.password
      hostname = url.hostname
      port = url.port
      db = url.path[1:]
  
      output_dir = os.path.abspath(os.path.join(
              os.path.curdir,
              args.output_dir))
  
      assert os.path.isdir(output_dir), 'Directory %s can\'t be found.' % output_dir
  
      output_dir = os.path.abspath(os.path.join(output_dir,
              '%s__%s'% ( db, today.strftime('%Y_%m_%d_%H%M%S'))
              ))
  
      logging.info('Backing up %s from %s to %s' % (db, hostname, output_dir))
  
      backup_output = subprocess.check_output(
              [
                  'mongodump',
                  '-host', '%s' % hostname,
                  '-u', '%s' % username,
                  '-p', '%s' % password,
                  '-d', '%s' % db,
                  '--port', '%s' % port,
                  '-o', '%s' % output_dir
              ])
  
      logging.info(backup_output)
  
  
  if __name__ == '__main__':
      args = parser.parse_args()
     
      try:
          backup(args)
      except AssertionError, msg:
          logging.error(msg)
  
  
subject: Add mongo backup example