Method extend

src/jinja2/environment.py:377–384

Add the items to the instance of the environment if they do not exist yet. This is used by :ref:`extensions <writing-extensions>` to register callbacks and configuration values without breaking inheritance.

(self, **attributes: t.Any)

        self.extensions.update(load_extensions(self, [extension]))

    def extend(self, **attributes: t.Any) -> None:
        """Add the items to the instance of the environment if they do not exist
        yet.  This is used by :ref:`extensions <writing-extensions>` to register
        callbacks and configuration values without breaking inheritance.
        """
        for key, value in attributes.items():
            if not hasattr(self, key):
                setattr(self, key, value)

    def overlay(
        self,