On Fri, Feb 11, 2022 at 10:26:03AM +0200, Serhiy Storchaka wrote:
> expandvars() does not operate on paths, it operates on strings and
> bytestrings. There is nothing path-specific here.
Paths can be strings and byte-strings too.
When I using my OS shell, and I type:
ls -l ~/code/
I am passing a path to ls as argument.
And when I do either of these in Python:
os.listdir(os.path.expanduser('~/code/'))
os.listdir(os.path.expandvars('${HOME}/code/'))
I am still passing a path to listdir. Its just not a pathlib.Path
instance, but it is still a path, just as "123 Main Road" is a street
address and "Jane Doe" is a name.
Of course environment variables are not restricted to being path
components, but neither are Paths:
>>> snake = Path('Chordata/Reptilia/Squamata/Serpentes')
>>> python = snake/'Pythonidae/Python'
>>> rock_python = python/'sebae'
>>> burmese_python = python/'bivittatus'
Is this an abuse of Path? Hell yes. What are we, the Path Police? :-)
The point is, regardless of whatever odd non-path-like things people
might happen to have in environment variables, they also have paths in
environment variables, and it is a strange lack that pathlib doesn't
make it easy to construct paths from environment variables.
If people want to shoot themselves in the foot:
myfile = Path('${HOME}/${LS_COLORS}/file.txt').expandvars()
that's up to them, and who knows, maybe somebody does actually have a
file with that path, no matter how odd it looks.
> Note that there are two implementations of expandvars(): in posixpath
> and ntpath. You may want to apply Posix substitution on Windows and
> Windows substitution on Linux or macOS, so it cannot be tied to
> PosixPath or WindowsPath.
That's odd. I would expect PosixPath.expandvars to use Posix-style
substitution, and WindowsPath.expandvars to use Windows-style
substitution.
--
Steve
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