pymel vert selection example

vtxselect.py

from pymel.core import *


ball = polySphere()[0]
bs = ball.getShape()

#Basic selection
select([i for i in bs.vtx if i.getPosition().y >= 0])

#more interesting things:
vtxList = [i.getPosition() for i in bs.vtx if i.getPosition().y >= 0 and i.getPosition().x % 3 == 0 or i.getPosition().y % 3 == 0]

curve(ep=vtxList)