That's one way to do it with no changes to the language, though syntaxically I find it lacking a bit of elegance (maybe a matter of getting accustomed with it?).
Also, I'm not sure "Final" really conveys what it means (at first glance, I thought it was about immutability, not constantness). Maybe "Const" would be better in this context ? (Or maybe you've discussed this question already and come to the conclusion that "Final" is better for some reason?) S. On Tue, Nov 21, 2017 at 11:41 AM, Ivan Levkivskyi <levkivs...@gmail.com> wrote: > On 21 November 2017 at 10:47, Paul Moore <p.f.mo...@gmail.com> wrote: > >> -1. I don't see how this would improve any programs I've written or >> seen. Tools like mypy or linters might benefit from a feature to track >> constants and ensure they don't get changed >> > > It is actually likely that something like this will appear in ``typing``: > > from typing import Final, List > > x: Final = 42 > x = 1 # Fails type check > > lst: Final[List[int]] = [] > lst.append(5) # OK > lst = [1, 2, 3] # Fails type check > > -- > Ivan > > > > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- Stefane Fermigier - http://fermigier.com/ - http://twitter.com/sfermigier - http://linkedin.com/in/sfermigier Founder & CEO, Abilian - Enterprise Social Software - http://www.abilian.com/ Chairman, Free&OSS Group / Systematic Cluster - http://www.gt-logiciel-libre.org/ Co-Chairman, National Council for Free & Open Source Software (CNLL) - http://cnll.fr/ Founder & Organiser, PyData Paris - http://pydata.fr/ --- “You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.” — R. Buckminster Fuller
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