code: def import_class(import_str):
      
      mod_str, _sep, class_str = import_str.rpartition('.')
      try:
          __import__(mod_str)
          return getattr(sys.modules[mod_str], class_str)
      except (ValueError, AttributeError):
          raise ImportError('Class %s cannot be found (%s)' %
                            (class_str,
                             traceback.format_exception(*sys.exc_info())))
docs: Returns a class from a string including module and class.