On Wed, Dec 1, 2021 at 10:40 PM Christopher Barker <python...@gmail.com> wrote:
> I know this isn't really the place for this conversation, but: > > >> which is what `os.PathLike` represents, hence why `str` isn't covered by >> it); >> > > wait, what? It seems so clear to me that "PathLike" (as a type specifier) > would mean: anything that can be passed into os.fspath to give me a path. > (or, of course to the stdlib functions that take paths) > That is not what the docs say: https://docs.python.org/3/library/os.html#os.PathLike. And as the creator of that ABC it's very much on purpose (see https://www.python.org/dev/peps/pep-0519/ for details). > Isn't the entire purpose of os.fspath that you can write code like: > > def fun(some_kind_of_path): > some_kind_of_path = os.fspath(some_kind_of_path) > > (or just pass it to a function you takes PathLIke) > > and go on your merry way -- e.g. duck typing, baby! > Depends on what "your merry way" is. As the docs say, os.fspath() is about getting the file system representation. That's not something to directly manipulate in a pathlib world unless you're using os.path to manipulate that string encoding (but which PEP 519 was specifically created to avoid such encoding headaches): https://docs.python.org/3/library/os.html#os.fspath . > > Is there really no way to annotate that simply now? > Once again, depends on what "simply" means to you. The examples I gave I don't find complicated, especially when we are talking about APIs that are trying to accept a broad set of types to convert into a single type. If you want to create a type variable that represents anything that is valid to `os.fspath()` or `pathlib.Path` to avoid typing out 2 or 4 types, then that can be considered for inclusion in the stdlib somewhere. But as I said previously, in my code I just take pathlib.Path or pathlib.PurePath and I'm done as I don't want to be dealing with encoded file paths and instead with objects that represent file paths. > > -CHB > > -- > Christopher Barker, PhD (Chris) > > Python Language Consulting > - Teaching > - Scientific Software Development > - Desktop GUI and Web Development > - wxPython, numpy, scipy, Cython >
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