swap_endpoints

swap_endpoints(k, ep1, ep2)

Swap two endpoints in place (no insertion/removal).

Parameters:

• k (PlanarDiagram | OrientedPlanarDiagram) – Diagram to modify.

• ep1 (Endpoint | tuple) – Endpoint or (node, position).

• ep2 (Endpoint | tuple) – Endpoint or (node, position).

Return type:

None