Finding way around ABCs (was What for -- for? (was A bug?))
On Wednesday, October 29, 2014 11:49:27 AM UTC+5:30, Zachary Ware wrote: On Wed, Oct 29, 2014 at 1:11 AM, Rustom Mody wrote: On Wednesday, October 29, 2014 11:10:06 AM UTC+5:30, Zachary Ware wrote: Of course, that's 3 (progressively shorter) loops to get the names of the ABCs of a class compared to 1 (fairly short in the first place) loop for a map of relationships to all available ABCs, but optimizing such a toy as this would just be an exercise in futility :) Not so. The charm of introspection is that the introspection itself can be introspected. For that to be convincing there needs to be a good combo of clarity and succinctness. In particular why not reduce the two functions to one? def get_abc_names(cls): return [abc.__name__ for abc in abcs if issubclass(cls,abc)] Well, it depends on what you actually want, the spec has been a bit fuzzy ;) Thanks for this much -- its helpful. Regarding ABCs -- is there a central documentation for them: What exactly is a sequence or iterable or etc protocol? This information seems to be strewn all over the place but systematically. -- https://mail.python.org/mailman/listinfo/python-list
Re: Finding way around ABCs (was What for -- for? (was A bug?))
On Thu, Oct 30, 2014 at 11:01 AM, Rustom Mody rustompm...@gmail.com wrote: On Wednesday, October 29, 2014 11:49:27 AM UTC+5:30, Zachary Ware wrote: On Wed, Oct 29, 2014 at 1:11 AM, Rustom Mody wrote: On Wednesday, October 29, 2014 11:10:06 AM UTC+5:30, Zachary Ware wrote: Of course, that's 3 (progressively shorter) loops to get the names of the ABCs of a class compared to 1 (fairly short in the first place) loop for a map of relationships to all available ABCs, but optimizing such a toy as this would just be an exercise in futility :) Not so. The charm of introspection is that the introspection itself can be introspected. For that to be convincing there needs to be a good combo of clarity and succinctness. In particular why not reduce the two functions to one? def get_abc_names(cls): return [abc.__name__ for abc in abcs if issubclass(cls,abc)] Well, it depends on what you actually want, the spec has been a bit fuzzy ;) Thanks for this much -- its helpful. Regarding ABCs -- is there a central documentation for them: What exactly is a sequence or iterable or etc protocol? This information seems to be strewn all over the place but systematically. Maybe the glossary? https://docs.python.org/3/glossary.html -- https://mail.python.org/mailman/listinfo/python-list
Re: Finding way around ABCs (was What for -- for? (was A bug?))
On Thu, Oct 30, 2014 at 11:09 AM, Ian Kelly ian.g.ke...@gmail.com wrote: On Thu, Oct 30, 2014 at 11:01 AM, Rustom Mody rustompm...@gmail.com wrote: On Wednesday, October 29, 2014 11:49:27 AM UTC+5:30, Zachary Ware wrote: On Wed, Oct 29, 2014 at 1:11 AM, Rustom Mody wrote: On Wednesday, October 29, 2014 11:10:06 AM UTC+5:30, Zachary Ware wrote: Of course, that's 3 (progressively shorter) loops to get the names of the ABCs of a class compared to 1 (fairly short in the first place) loop for a map of relationships to all available ABCs, but optimizing such a toy as this would just be an exercise in futility :) Not so. The charm of introspection is that the introspection itself can be introspected. For that to be convincing there needs to be a good combo of clarity and succinctness. In particular why not reduce the two functions to one? def get_abc_names(cls): return [abc.__name__ for abc in abcs if issubclass(cls,abc)] Well, it depends on what you actually want, the spec has been a bit fuzzy ;) Thanks for this much -- its helpful. Regarding ABCs -- is there a central documentation for them: What exactly is a sequence or iterable or etc protocol? This information seems to be strewn all over the place but systematically. Maybe the glossary? Also the documentation for the collections.abc and numbers modules: https://docs.python.org/3/library/collections.abc.html https://docs.python.org/3/library/numbers.html -- https://mail.python.org/mailman/listinfo/python-list
Re: Finding way around ABCs (was What for -- for? (was A bug?))
On Thursday, October 30, 2014 10:40:42 PM UTC+5:30, Ian wrote: On Thu, Oct 30, 2014 at 11:01 AM, Rustom Mody wrote: On Wednesday, October 29, 2014 11:49:27 AM UTC+5:30, Zachary Ware wrote: On Wed, Oct 29, 2014 at 1:11 AM, Rustom Mody wrote: On Wednesday, October 29, 2014 11:10:06 AM UTC+5:30, Zachary Ware wrote: Of course, that's 3 (progressively shorter) loops to get the names of the ABCs of a class compared to 1 (fairly short in the first place) loop for a map of relationships to all available ABCs, but optimizing such a toy as this would just be an exercise in futility :) Not so. The charm of introspection is that the introspection itself can be introspected. For that to be convincing there needs to be a good combo of clarity and succinctness. In particular why not reduce the two functions to one? def get_abc_names(cls): return [abc.__name__ for abc in abcs if issubclass(cls,abc)] Well, it depends on what you actually want, the spec has been a bit fuzzy ;) Thanks for this much -- its helpful. Regarding ABCs -- is there a central documentation for them: What exactly is a sequence or iterable or etc protocol? This information seems to be strewn all over the place but systematically. Maybe the glossary? https://docs.python.org/3/glossary.html Ummm... I was looking for something more reference-ish, ie More prolix for ABCs And not containing random bits of unconnected data like - What is CPython - What is EAFP Maybe there's something in the bowels of the C(Python)-code? -- https://mail.python.org/mailman/listinfo/python-list
