Today I was doing a major re-write of a library I called yajl-py that wraps the json 'sax-like' c-parser yajl, and decided I should look into absract base classes since I knew they had been added to py26. Truthfully, I was surprised when I found out that the BDFL accepted this PEP, but hey were in 2010 :p.
So I was getting around to using it when I realised that I cannot make my class as abstract as can be. Here is my dilemma / requirements: 1. To create a YajlContentHandler class that forces all sub-classers to implement a certain set of methods. (Great, thats what ABC is for) There is a certain set of mutually exclusive callbacks, i.e. if you implement the first set you need not implement the second, and vice versa, so my second requirement is: 2. Conditional Abstractness! if certain methods are not implemented then be able to require some method to be implemented. Python is more flexible than Java, so having Conditional Meta Abstract Base Classes seems only natural :P, maybe someone should write a PEP. This only reminds me of the following tweet: http://twitter.com/bos31337/status/13349058839 -- Hatem Nassrat -- http://mail.python.org/mailman/listinfo/python-list
