The prototype does, now I have to implement the real thing.
Is there any way to add this info to the documentation? It took me a lot of trial and error to figure out how to do what I wanted.
S. * Travis Scrimshaw <tsc...@ucdavis.edu> [2019-09-26 15:11:07]:
So it works now, correct? Best, Travis On Friday, September 27, 2019 at 12:42:23 AM UTC+10, Salvatore Stella wrote:Oops, I think that I figured out where the mistake was. Here is the correct code: class OldFoo(UniqueRepresentation): @staticmethod def __classcall__(self, data, **kwargs): hashable_data = tuple(data) kwargs['some_default_option'] = 'bar' return super(OldFoo, self).__classcall__(self, hashable_data, **kwargs) def __init__(self, data, **kwargs): self._data = data self._some_default_option = kwargs['some_default_option'] def __repr__(self): return 'Data = %s, option = %s'%(self._data, self._some_default_option) class NewFoo(OldFoo): @staticmethod def __classcall__(self, data, **kwargs): new_data = data+data return super(NewFoo, self).__classcall__(self, new_data, **kwargs) Thanks S. * Travis Scrimshaw <tsc...@ucdavis.edu <javascript:>> [2019-09-25 16:59:13]: >Although it almost sounds like you should be doing the NewFoo preparsing >inside NewFoo.__classcall__ (or NewFoo.__classcall_private__), which then >should get passed up and handled by OldFoo.__classcall__. You might need >some extra *args or **kwds to the __init__ and/or __classcall__ to handle >this. The other option would be to separate out the preparsing portion into >a separate @classmethod or @staticmethod. > >Best, >Travis > > >On Thursday, September 26, 2019 at 9:55:56 AM UTC+10, Travis Scrimshaw >wrote: >> >> Make OldFoo.__classcall_private__, then it is not inherited. >> >> Best, >> Travis >> >> >> On Thursday, September 26, 2019 at 8:22:23 AM UTC+10, Salvatore Stella >> wrote: >>> >>> Dear All, >>> I would like to make a new class inheriting from a class based on >>> UniqueRepresentation. My goal, among other things, is to preparse the >>> arguments a little before calling the class I am inheriting from. >>> Unfortunately this class also does some preparsing via __classcall__ to >>> make >>> the input hashable. Could you point me to the correct way of setting this >>> up? >>> >>> Sketch of the situation: >>> >>> class OldFoo(UniqueRepresentation): >>> >>> @staticmethod >>> def __classcall__(self, data): >>> # make data hashable >>> return super(oldFoo, self).__classcall__(self, hashable_data) >>> >>> def __init__(self, hashable_data): >>> # do something >>> >>> class NewFoo(OldFoo): >>> >>> # First neutralize OldFoo __classcall__ >>> __classcall__ = None >>> >>> def __init__(self, data): >>> # preparse data then initialize OldFoo >>> >>> >>> If __classcall__ were not there I would call OldFoo.__init__ but this >>> does >>> not seem to work with OldFoo.__classcall__ >>> >>> >>> Thanks >>> S. >>> >>> >>> >>> > >-- >You received this message because you are subscribed to the Google Groups "sage-devel" group. >To unsubscribe from this group and stop receiving emails from it, send an email to sage-...@googlegroups.com <javascript:>. >To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/5475d883-8c54-4a8b-8fb5-f33859e464a3%40googlegroups.com.-- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/869947d6-8388-4455-96a2-75550bad4dd1%40googlegroups.com.
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