[SQLObject] sqlobject how to limit return column list

Hi. I love sqlojbect very much.
  
Please forgive my poor English,

Example code:

class MyUser(SQLObject):
  name=StringCol()
  mobile=StringCol()
  ….
  depart=StringCol()
  sex =StringCol()

i want limit return column,
data=MyUser.selectBy(depart=‘xxx’,items=[’name’,’sex'])

only name and sex column in data.

Any help would be much appreciated!