On Tue, 12 Jul 2022, 18:05 Steve Jorgensen, <stevecjor@gmail.com> wrote:
On Mon, 11 Jul 2022 at 03:54, Steve Jorgensen stevecjor@gmail.com wrote:
David Mertz, Ph.D. wrote: I've seen this thread, and also wondered why anyone could EVER want a dataclass that is an enum. Nothing I've seen in the thread gives me any hint about that, really. On Sun, Jul 10, 2022 at 7:44 AM Barry Scott barry@barrys-emacs.org wrote: On 9 Jul 2022, at 22:53, Steve Jorgensen stevecjor@gmail.com wrote: I don't think that dataclasses have the limited set of intended uses that you are interpreting them as having. To me, the fact that they can be frozen makes them a good fit with Enum. Please quote the email that you are replying to. It is usually considered a code smell to have a class that is two or more things. This seems to be what you are trying to do. How can one class be a set of fields and also the enum for one of its own fields? I do not understand why this is resonable. Barry Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-leave@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at
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Code of Conduct: http://python.org/psf/codeofconduct/ -- Keeping medicines from the bloodstreams of the sick; food from the bellies of the hungry; books from the hands of the uneducated; technology from the underdeveloped; and putting advocates of freedom in prisons. Intellectual property is to the 21st century what the slave trade was to the 16th. Sorry, I don't know how I communicated that I was trying to have one class be a set of fields and also the enum for one of its own fields. I'm really just wanting to have each member of the enum be an instance of a frozen dataclass. If an of the dataclass fields were of an enum type,
Chris Angelico wrote: then it would presumably not be for the same enum. In my example, none of the fields of the dataclass contains an enum. One contains a string, and the other contains an int.
Just throwing an idea out there, but would it work better to have an enum-namedtuple instead? ChrisA
The only benefit I can think of for namedtuple vs a dataclass is compactness in memory, but the number of members of an enum is typically very small. I think the extra flexibility of a dataclass makes more desirable for this purpose.
The ability to unpack a namedtuple as an iterable is considered to be a great advantage the dataclass has over the named tuple because changing the number of members is a backwards incompatible change for namedtuple. No reason in principle why a frozen dataclass should be less memory efficient than a namedtuple (?). Michael _______________________________________________
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