symmetry, preserving uvs

gistfile1.py

def symmetry(edit, original):
    mirror = mirrorBlendshape([edit],original)[0]
    copy = cmds.duplicate(original)[0]
    bldShp = cmds.blendShape(edit, mirror,copy)[0]
    cmds.setAttr('%s.%s' % (bldShp, edit), 1)
    cmds.setAttr('%s.%s' % (bldShp, mirror), 1)
    symmetry = cmds.duplicate(copy)[0]
    symmetry = cmds.rename(symmetry, original + '_symmetry')
    
    cmds.delete(copy, mirror)
    
    return symmetry

targets = cmds.ls(selection=True)[0]
orig = cmds.ls(selection=True)[-1]
symmetry(targets,orig)