On Tue, Nov 21, 2017 at 11:03 AM, Serhiy Storchaka <storch...@gmail.com> wrote:
> 21.11.17 11:34, Saeed Baig пише: > >> Serhiy asked, in relation to constants, “To do what? What problem do you >> need to solve?”. No problem in particular, to be honest. I just thought >> they’d be nice since they’d increase confidence that my >> variables-intended-to-be-constants wouldn’t get reassigned, and just to >> increase readability/explicitness to other programmers. >> > > For increasing readability/explicitness you can use a name convention > (UPPER_CASE), comments and documentation. > UPPER_CASE variable names are a reasonable convention for global constants. I wouldn't like to read something like: for i in range(0, 100): FOO = f(i) BAR = g(i, FOO) do_something_with(BAR) but rather: for i in range(0, 100): const foo = f(i) const bar = g(i, foo) do_something_with(bar) or: for i in range(0, 100): let foo = f(i) let bar = g(i, foo) do_something_with(bar) If we move on with this idea (which is a long shot of course), choosing between 'let' and 'const' is a matter of taste and being consistent with other languages. As for increasing confidence that your variables-intended-to-be-constants > wouldn’t get reassigned, you can use read-only properties. This is a tricky > to implement read-only properties for modules, but see PEP 562 which should > help to do this. > > Please don't use GIGANTIC font in your messages. > +1. S. > > And please don't create a new thread when answer. > > And *please* don't include unrelated text in your messages. > > > _______________________________________________ > 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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