It's useful when you want a sentinel object and you don't want to use None as the sentinel because it is a valid value. Some discussion here: http://www.ianbic

It's useful when you want a sentinel object and you don't want to use None as the sentinel because it is a valid value. Some discussion here: http://www.ianbicking.org/blog/2008/12/the-magic-sentinel.html http://www.ianbicking.org/blog/2008/12/the-magic-sentinel.ht...