code: def get_version(brain_or_object):
      
      obj = get_object(brain_or_object)
      if not is_versionable(obj):
          return None
      return getattr(aq_base(obj), "version_id", 0)
docs: Get the version of the current object
  
      :param brain_or_object: A single catalog brain or content object
      :type brain_or_object: ATContentType/DexterityContentType/CatalogBrain
      :returns: The current version of the object, or None if not available
      :rtype: int or None