On Mon, Dec 20, 2021 at 1:42 PM Mark Shannon <[email protected]> wrote: > OOI, of those 1577 Callable type hints, how many distinct Callable types? > > Good question. About 30 callables for source code itself and an additional 60 for pytest factory fixtures.
> On 20/12/2021 7:52 am, Andrew Svetlov wrote: > > At my job, we have 1577 Callable type hints scattered in 1063 Python > files. > > For comparison, this codebase also has 2754 dict annotations and 1835 > list ones. > > > > On Mon, Dec 20, 2021 at 8:11 AM Christopher Barker <[email protected] > <mailto:[email protected]>> wrote: > > > > note: I wasn't thinking -- typeshed, of course, has a lot more than > the standard lib. But it's still a collection of widely used somewhat > general purpose libraries. So I think my hypothesis is still valid. > > > > -CHB > > > > > > On Sun, Dec 19, 2021 at 8:54 PM Christopher Barker < > [email protected] <mailto:[email protected]>> wrote: > > > > A question that came up for me is: > > > > How common is it to need to use Callable for type hints? > particularly complex versions, specifying what parameters the Callable > takes? A more compact and easier to read syntax is nice, but not very > important if it isn't used much. > > > > My first thought on this was that I can't remember a single time > that I wrote production code that took a Callable as a function parameter > -- or returned one -- OK maybe a few times, but it's certainly rare in my > production code. > > > > So I looked in the PEP to see if that issue was addressed, and > indeed it is: > > > > "The Callable type is widely used. For example, as of October > 2021 it was the fifth most common complex type in typeshed," > > > > That did surprise me, but on thinking about it, maybe not so > much. It strikes me that Callable is most likely to be used in fairly low > level, general purpose functions, like map(), sort(), various functions in > itertools, etc. Just the sort of functions that are common in the standard > library, but may not so much in production code. > > > > I have no idea how to evaluate how common it is in production > code -- maybe type hinting is common enough now that PyPi could be > searched -- but even PyPi is a biased sample, as it is full of, by > definition, libraries for others' use -- i.e. general purpose tools (less > general that the stad lib, but still not specialty production code, which I > suspect is the majority of Python code out there). > > > > Perhaps some folks that have been type=hinting their production > code bases could provide anecdotal evidence. > > > > Anyway, if my hypothesis is correct, then it's not so bad that > not-so-nice syntax is required to type hint general purpose utilities. > > > > -CHB > > > > -- > > Christopher Barker, PhD (Chris) > > > > Python Language Consulting > > - Teaching > > - Scientific Software Development > > - Desktop GUI and Web Development > > - wxPython, numpy, scipy, Cython > > > > > > > > -- > > Christopher Barker, PhD (Chris) > > > > Python Language Consulting > > - Teaching > > - Scientific Software Development > > - Desktop GUI and Web Development > > - wxPython, numpy, scipy, Cython > > _______________________________________________ > > Python-Dev mailing list -- [email protected] <mailto: > [email protected]> > > To unsubscribe send an email to [email protected] <mailto: > [email protected]> > > https://mail.python.org/mailman3/lists/python-dev.python.org/ < > https://mail.python.org/mailman3/lists/python-dev.python.org/> > > Message archived at > https://mail.python.org/archives/list/[email protected]/message/LWIXFDUGRM6Z3KHI3YGV65HWXRD2S4H5/ > < > https://mail.python.org/archives/list/[email protected]/message/LWIXFDUGRM6Z3KHI3YGV65HWXRD2S4H5/ > > > > Code of Conduct: http://python.org/psf/codeofconduct/ < > http://python.org/psf/codeofconduct/> > > > > > > > > -- > > Thanks, > > Andrew Svetlov > > > > _______________________________________________ > > Python-Dev mailing list -- [email protected] > > To unsubscribe send an email to [email protected] > > https://mail.python.org/mailman3/lists/python-dev.python.org/ > > Message archived at > https://mail.python.org/archives/list/[email protected]/message/JYZGIDEBV4R5E7XXT3KFS2O545TDTAGT/ > > Code of Conduct: http://python.org/psf/codeofconduct/ > > > -- Thanks, Andrew Svetlov
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