code: def clean(data):
      """Remove all keys where value is None"""
      return dict((k, v) for k, v in iteritems(data) if v is not None)
  
imports: from __future__ import unicode_literals, absolute_import
  from time import time
  from uuid import uuid5, NAMESPACE_URL
  from six import iteritems
  from six.moves.urllib.parse import urlencode
label_desc: Use image node_id 1 for calling a global function with example usage: clean(data) and returns: dict