import pymel.core as pm

myNode = pm.ls(type=pm.nodetypes.Mesh)[0]

def printVtxPos():
    VPL = []
    for x in myNode.vtx:
        VPL.append(x.getPosition())

    for z in VPL:
        s = ('v ' + str(z[0]) + ' ' + str(z[1]) + ' ' + str(z[2]))
        print s

printVtxPos()