Remove redunant code from RunPython operation

        # object, representing the versioned models as an app registry.

        # We could try to override the global cache, but then people will still

        # use direct imports, so we go with a documentation approach instead.

        if callable(self.code):

        self.code(models=from_state.render(), schema_editor=schema_editor)

        else:

            context = {

                "models": from_state.render(),

                "schema_editor": schema_editor,

            }

            eval(self.code, context)

    def database_backwards(self, app_label, schema_editor, from_state, to_state):

        if self.reverse_code is None:

            raise NotImplementedError("You cannot reverse this operation")

        elif callable(self.reverse_code):

        self.reverse_code(models=from_state.render(), schema_editor=schema_editor)

        else:

            context = {

                "models": from_state.render(),

                "schema_editor": schema_editor,

            }

            eval(self.reverse_code, context)

    def describe(self):

        return "Raw Python operation"