http://www.mikeash.com/?page=pyblog/friday-qa-2010-11-19-creating-classes-at-runtime-for-fun-and-profit.html#commentsmikeash.com Recent CommentsMon, 17 Aug 2026 11:48:10 GMTPyRSS2Gen-1.0.0http://blogs.law.harvard.edu/tech/rsshttp://www.mikeash.com/?page=pyblog/friday-qa-2010-11-19-creating-classes-at-runtime-for-fun-and-profit.html#commentsUsing <code>self-&gt;isa</code> to look up the superclass assumes that your class will never be subclassed, which isn't generally a good assumption to make. (KVO can mess with you, if nothing else.) If you're doing this for real, you'd probably want to put the class lookup in exactly one place, then reference that from both the subclass creation function and any methods that need to call through to the superclass implementation.17eb6ccce44598e3951cd658bd5a5fefSat, 20 Nov 2010 16:27:20 GMThttp://www.mikeash.com/?page=pyblog/friday-qa-2010-11-19-creating-classes-at-runtime-for-fun-and-profit.html#commentsSeems fragile to hard-code the superclass name like that. Wouldn't it be better to grab the superclass through self-&gt;isa?eef7d47087fbdcb26e445141235ece66Sat, 20 Nov 2010 04:55:26 GMThttp://www.mikeash.com/?page=pyblog/friday-qa-2010-11-19-creating-classes-at-runtime-for-fun-and-profit.html#commentswell done sir, again.0ffff47ce0d98d332812c42caac153daFri, 19 Nov 2010 18:07:01 GMT