coleifer/peewee — pull request #37 by drewyeaton (2011-12-31 05:08:38+00:00)
Title: Added __isnull column lookup for Django-style NULL and NOT NULL value

I realize this can be accomplished with a Q object, but it's arguably harder to read queries using them. This also is available in the standard Django API, so it may not hurt to have more feature parity on this level.