On 01/11/14 18:29, Ethan Furman wrote: > On 11/01/2014 10:11 AM, Ned Batchelder wrote: >> On 11/1/14 12:56 PM, duncan smith wrote: >>> >>> I have a Bloom filter class and want to (partially) serialize >>> instances using hex() or oct(). Instances are mutable, so I can't >>> inherit from long. I thought I'd found the answer when I came across >>> __index__, it doesn't seem to work as I expected it to. >> >> Just above your link in the docs is __oct__ and __hex__, which are >> used to implement oct() and hex(): >> https://docs.python.org/2/reference/datamodel.html#object.__oct__ > > In Python 2 __oct__ and __hex__ are used for oct() and hex(), but in > Python 3 __index__ is used. >
It was the doc for hex at https://docs.python.org/2/library/functions.html that led me to think I needed to implement the _index__ method. The doc for bin and oct seems to be right (I need __index__ for bin, but it doesn't work for oct). > But I agree with Net that using a separate method is probably better. > > -- > ~Ethan~ Possibly, I'm still tinkering with it. I use the Bloom filters to generate, and act as pseudonyms for token sets. I have another class that represents pseudonyms (of a different kind, but still bit strings) that is derived from long - so hex etc. just work. I should probably (at least) subclass my Bloom filter class before adding the relevant methods. Cheers. Duncan -- https://mail.python.org/mailman/listinfo/python-list
