On Apr 11 2016, Ethan Furman <ethan-gcWI5d7PMXnvaiG9KC9N7Q@public.gmane.org> wrote:
On 04/11/2016 07:43 AM, Nikolaus Rath wrote:
On Apr 10 2016, Ethan Furman wrote:
By having a well-defined protocol and helper function we not only make our own lives easier but we also make the lives of third-party libraries and experimenters easier.
To me this sounds like catering to a hypothetical audience that may want to do hypothetical things. If you start with the above, and people complain that their favorite non-pathlib path library is not supported by the stdlib, you can still add a protocol. But if you add a protocol right away, you're stuck with the complexity for a very long time even if almost no one actually uses it.
The part of "make our own lives easier" is not a hypothetical audience.
My assumption was that "own" refers to core developers here, while..
Making my own library (antipathy) work seamlessly with pathlib and DirEntry is not hypothetical.
..here you seem to be wearing your third-party maintainer hat :-). As far as I can see, implementing a protocol instead of adding a few isinstance checks is more likely to make the life of a CPython developer harder than easier. Best, -Nikolaus -- GPG encrypted emails preferred. Key id: 0xD113FCAC3C4E599F Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F »Time flies like an arrow, fruit flies like a Banana.«