I'm sure you can find examples of modes. For example open() obviously has a string mode and binary mode which are importantly different. I myself use Pandas a lot, and it is absolutely thick with modes (but is very unpythonic in numerous ways). Even print() with sep and end options has a kind of mode.
Nonetheless, I think it is a clear guiding principle in Python that a new function name is better than a mode when there are only two or three behaviors... Other things being equal (which they often are not). On Sat, Apr 25, 2020, 1:25 PM Christopher Barker <python...@gmail.com> wrote: > On Sat, Apr 25, 2020 at 10:11 AM David Mertz <me...@gnosis.cx> wrote: > >> I have no objection to adding a zip_strict() or zip_exact() to itertools. >> I am used to the current behavior, and am apparently in minority in not >> usually assuming common length iterators. Say +0 on a new function. >> > > I'd say I'm +0 also -- I don't think it'll get used much. > > But I'm definitely -1 on adding a mode switch to the built-in. This is not >> the way Python is usually done. zip_longest() is a clear example, >> > > Yes, indeed. But there is a difference here. If you want zip_longest > capability, your code simply can not work with zip(). So folks will make > the effort to go import it from itertools. > > But most code that could benefit from "strict" behavior will run fine with > zip() -- just with less safely, or making a safety check separately. So I > don't think a function in itertools would get used much > > Granted, that doesn't say anything about the API consistency (or lack > thereof) of adding a "mode flag" -- if that's important, then, well, I > guess it's not an option. Are there really no mode flags in Python? (I do > recall a quote attributed to Guido about not using a two-mnode flag, when > another function will do). > > >> but so is the recent cut_suffix (or whatever final spelling was chosen). >> Some folks wanted a mode switch on .rstrip(), and that was appropriately >> rejected. >> > > In my mind that was more about consistency with the rest of the string API > than about a global "that's not how we do things in Python" -- but It may > have been both. > > - CHB > > > > -- > Christopher Barker, PhD > > Python Language Consulting > - Teaching > - Scientific Software Development > - Desktop GUI and Web Development > - wxPython, numpy, scipy, Cython >
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