parameters: (self)
docstring: Inform the instance that `self.key` has been changed
docstring_summary: Inform the instance that `self.key` has been changed
docstring_tokens: Inform the instance that self . key has been changed
function: def _mark_as_changed(self):
          """Inform the instance that `self.key` has been changed"""
          if self.instance:
              self.instance._mark_as_changed(self.key)
function_tokens: def _mark_as_changed ( self ) : if self . instance : self . instance . _mark_as_changed ( self . key )