Author ethan.furman
Recipients ethan.furman
Date 2013-12-28.19:56:32
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1388260592.79.0.323683192221.issue20092@psf.upfronthosting.co.za>
In-reply-to
Content
In order to create a coherent integer type class both __int__ and __index__ must be defined or the resulting instances will behave inconsistently in different places.

For example, if __index__ is not defined then the class cannot be used in slices, and if __int__ is not defined then int(integer_type) will fail.

At this point the programmer must remember to define both, but since they should return the same value we can have the type constructor automatically assign __int__ to __index__ when the latter is defined and the former is not.  This would be similar to how we currently treat __ne__ when __eq__ is defined.
History
Date User Action Args
2013-12-28 19:56:32ethan.furmansetrecipients: + ethan.furman
2013-12-28 19:56:32ethan.furmansetmessageid: <1388260592.79.0.323683192221.issue20092@psf.upfronthosting.co.za>
2013-12-28 19:56:32ethan.furmanlinkissue20092 messages
2013-12-28 19:56:32ethan.furmancreate