> There can be 2 escape characters '\' and '.' That's clever, but then we have to put a slash in front of names in imports, assignments and keyword arguments, but not properties.
-- Carl Smith carl.in...@gmail.com On 16 May 2018 at 19:17, Carl Smith <carl.in...@gmail.com> wrote: > > Not if you need to make changes in the same tens of thousands of lines > file. > > But what has that got to do with the the syntax of the new code? The old > code is > what it is. > > I did think after I replied that `True` wasn't actually reserved until > more recently, but > the point still stands: You would be able to reference the name *as > defined* in an > external library, and yeah, it could refer to anything, but that's kinda > the point. We > have to assume the library does something sane with the name. We can't > preempt > an employee sabotaging `True`. > > As a more realistic example (if not for Python), say `until` became a > keyword, then > you could end up with lines like this: > > from oldlib import until as upto > > dance(until="am") > > event.until = time(9, 30) > > > The overall issue is that python has no way of knowing if the keyword > is being used for legitimate > > backwards-compatibility purposes or someone intentionally overrode after > it was made a keyword > > because they somehow thought it was a good idea. > > I only said that Python does not know *until runtime*, and I was wrong > when I described that as a > problem. A runtime NameError actually makes perfect sense. Assigning to > `self.until` > or assigning > to `until` inside a subclass should not be a syntax error. A NameError > would be correct. > > It worth mentioning that the cost of checking only applies to cases where > the name in question is also > keyword, so almost never. > > > -- Carl Smith > carl.in...@gmail.com > > On 16 May 2018 at 16:40, Niki Spahiev <niki.spah...@gmail.com> wrote: > >> On 16.05.2018 16:05, Andrés Delfino wrote: >> >>> IMHO, it would be much easier to learn and understand if keywords can >>> only >>> be used by escaping them, instead of depending where they occur. >>> >> >> There can be 2 escape characters '\' and '.' >> >> Niki >> >> >> >> _______________________________________________ >> Python-ideas mailing list >> Python-ideas@python.org >> https://mail.python.org/mailman/listinfo/python-ideas >> Code of Conduct: http://python.org/psf/codeofconduct/ >> > >
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