Edge Class — langchain Architecture

Source Code

libs/core/langchain_core/runnables/graph.py lines 63–90

class Edge(NamedTuple):
    """Edge in a graph."""

    source: str
    """The source node id."""
    target: str
    """The target node id."""
    data: Stringifiable | None = None
    """Optional data associated with the edge. """
    conditional: bool = False
    """Whether the edge is conditional."""

    def copy(self, *, source: str | None = None, target: str | None = None) -> Edge:
        """Return a copy of the edge with optional new source and target nodes.

        Args:
            source: The new source node id.
            target: The new target node id.

        Returns:
            A copy of the edge with the new source and target nodes.
        """
        return Edge(
            source=source or self.source,
            target=target or self.target,
            data=self.data,
            conditional=self.conditional,
        )