code: def init_app(self, app, context=DEFAULT_DICT):
          
          if context is not _CONTEXT_MISSING:
              self.update_context(context, app=app)
  
          # do not readd callbacks if already present; and if there's no context
          # present, there's no real need to add callbacks
          if (app not in _CONTEXT_CALLBACK_MAP
                  and context is not _CONTEXT_MISSING):
              key = self._get_context_name(app=app)
              self._context_callbacks(app, key, original_context=context)
docs: Lazy constructor for the :class:`Component` class.
  
          This method will allow the component to be used like a Flask
          extension/singleton.
  
          Args:
              app (flask.Flask): The Application to base this Component upon.
                  Useful for app wide singletons.
  
          Keyword Args:
              context (dict, optional): The contextual information to supply to
                  this component.