Iterate throught selected components via OpenMaya #Snippet

iterate_selected_components.py

import maya.OpenMaya as om
sel = om.MSelectionList()
om.MGlobal.getActiveSelectionList(sel)

dag = om.MDagPath()
component = om.MObject()
sel.getDagPath(0, dag, component)

if not component.isNull():
	if component.hasFn(om.MFn.kMeshPolygonComponent):
		print "face"
		om.MItMeshPolygon(dag, component)
		face_itr = om.MItMeshPolygon(dag, component)
		while not face_itr.isDone():
			print face_itr.index()
			face_itr.next()
	elif component.hasFn(om.MFn.kMeshEdgeComponent ):
		print "edge"
		om.MItMeshEdge(dag, component)
		edge_itr = om.MItMeshEdge(dag, component)
		while not edge_itr.isDone():
			print edge_itr.index()
			edge_itr.next()
	elif component.hasFn(om.MFn.kMeshVertComponent  ):
		print "vert"
		om.MItMeshVertex(dag, component)
		vert_itr = om.MItMeshVertex(dag, component)
		while not vert_itr.isDone():
			print vert_itr.index()
			vert_itr.next()