Return a list of AttrX and NameX from the expression.

def names_from_exp(exp):
  "Return a list of AttrX and NameX from the expression."
  def match(exp):
    return isinstance(exp, (sqparse2.NameX, sqparse2.AttrX))
  paths = treepath.sub_slots(exp, match, match=True, recurse_into_matches=False)
  return [exp[path] for path in paths]