Method replace

lib/sqlalchemy/sql/visitors.py:760–769

Receive pre-copied elements during a cloning traversal. If the method returns a new element, the element is used instead of creating a simple copy of the element. Traversal will halt on the newly returned element if it is re-encountered.

(
        self, elem: ExternallyTraversible
    )

    __slots__ = ()

    def replace(
        self, elem: ExternallyTraversible
    ) -> Optional[ExternallyTraversible]:
        """Receive pre-copied elements during a cloning traversal.

        If the method returns a new element, the element is used
        instead of creating a simple copy of the element.  Traversal
        will halt on the newly returned element if it is re-encountered.
        """
        return None

    @overload
    def traverse(self, obj: Literal[None]) -> None: ...