code: def obj_or_import_string(value, default=None):
      
      if isinstance(value, six.string_types):
          return import_string(value)
      elif value:
          return value
      return default
docs: Import string or return object.
  
      :params value: Import path or class object to instantiate.
      :params default: Default object to return if the import fails.
      :returns: The imported object.