bmesh - deleting by mode (context)

To remove vertices, edges or polygons from a bmesh object, it is most convenient to use the remove() method for the corresponding set of elements. In addition, the bmesh object has a bmesh.ops.delete() operator, which allows us to delete elements using different modes (context).

Read more: https://b3d.interplanety.org/en/bmesh-deleting-by-mode-context/