code: def get_file(original_file):
      
      import cStringIO
      import boto3
      s3 = boto3.resource('s3')
      bucket_name, object_key = _parse_s3_file(original_file)
      logger.debug("Downloading {0} from {1}".format(object_key, bucket_name))
      bucket = s3.Bucket(bucket_name)
      output = cStringIO.StringIO()
      bucket.download_fileobj(object_key, output)
      output.reset()
      return output
docs: original file should be s3://bucketname/path/to/file.txt
  
      returns a Buffer with the file in it