On 3/16/21 8:22 AM, Roland Puntaier via Python-ideas wrote: > On Mon 21Mar15 15:18, Paul Bryan wrote: >> On Mon, 2021-03-15 at 11:13 +0100, Roland Puntaier via Python-ideas >> wrote: >> >>> I hesitate to call this proposal a language change. It is rather a >>> syntactic allowance, like that of the trailing comma before the >>> terminating token. >> >> If implemented, such a proposal would in fact require a change to the >> language specification. > > Yes. What I meant is, that it is minor, > equivalent to the `,]` change. > >> >>> Can `x=[,1,2]` possibly be used for some future language feature, >>> liking making `[,` a operator of its own? Considering that one has >>> already decided that `,]` will not be allowed to have a separate >>> meaning in the future, then, so should neither `[,`. >> >> It would be helpful to me to understand what friction you're currently >> experiencing without such a change. I'm still struggling to appreciate >> what the benefit would be, beyond aesthetic preference. > > I'd like to write > > def my_long_function_name( > , my_long_option_2 = "some default expression 1".split() > , my_long_option_1 = "some default expression 1".split() > ): > pass > > Then, I'd like to change the order of the lines without having to care > to remove and add a comma. > > To allow `,]` was motivated by aesthetic preferences (PEP8). > To allow both `[,`, and `,]` is aesthetically more neutral. > > So, the proposal is based on the already done `,]` language feature. > The proposal adds some syntactic flexibility, > which avoids errors in situations like the one described.
My thought is that there is a line in the Zen > There should be one-- and preferably only one --obvious way to do it. That says that the langauge doesn't desire to be aesthetically neutral, but will intentionally choose a preferred way to do something. Other ways may be possible, if there is a good reason (and sometimes that is just due to backwards compatibility when a better way to do something in discovered). This rule is even literally baked into the language due to 'import this' I think this means you need a stronger motivation than you just want another way to do the same thing, -- Richard Damon _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/US5MJJA2KTE6QVCX5GR5ORZWLSICX6GO/ Code of Conduct: http://python.org/psf/codeofconduct/
