code: def on_bind_target(self, target, ctx=None):
          
  
          _on_bind_target = getattr(self, Annotation._ON_BIND_TARGET, None)
  
          if _on_bind_target is not None:
              _on_bind_target(self, target=target, ctx=ctx)
docs: Fired after target is bound to self.
  
          :param target: newly bound target.
          :param ctx: target ctx.