"lbolla" <lbolla at gmail.com> wrote in message news:f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b at q16g2000yqq.googlegroups.com... On Mar 31, 7:49 am, "Frank Millman" <fr... at chagford.com> wrote: >> Hi all >> > When subclassing immutable types, you need to override __new__; > otherwise you need to override __init__. Perfect. Thanks very much. Frank