On Mon, Apr 26, 2021 at 10:31 PM Brett Cannon <br...@python.org> wrote:
> > > On Mon, Apr 26, 2021 at 9:37 AM Baptiste Carvello < > devel2...@baptiste-carvello.net> wrote: > >> Hi, >> >> sorry for being late to the party, but I may not be the only one >> wondering… >> >> Le 14/04/2021 à 20:56, Barry Warsaw a écrit : >> > >> > I’d forgotten that this PEP was in Deferred state. I think it should >> be rejected and I plan on making that change. importlib.metadata is a much >> better approach to programmatically determining package versions. >> > >> > >> https://docs.python.org/3/library/importlib.metadata.html#distribution-versions >> >> This is indeed the correct approach, thanks for letting me learn this. >> >> However, I unsuccessfully searched for the canonical way to look up the >> distribution name based on either a module name or an imported module >> object. Is there one? >> > > If you mean how to tie a module back to its name on PyPI, you should be > able to look up the "Name" in the project's metadata: > https://docs.python.org/3/library/importlib.metadata.html#distribution-metadata > . > > The missing bit here, for me, is how do you map a module back to it's project (distribution)? For example: ``` >>> import bs4 >>> bs4.__version__ '4.9.1' >>> importlib.metadata.metadata('bs4') PackageNotFoundError: bs4 ``` This is because the distribution calls itself 'beautifulsoup4' instead. The same goes for another package: `umap`, for which the distribution is called `umap-learn` This is the best I could come up with from reading the docs: import bs4 #<- This is the module we want the version of import importlib import sys from itertools import chain from pathlib import Path loaders = sys.meta_path target_path = Path(bs4.__file__) distros = list(chain(*(finder.find_distributions() for finder in loaders if hasattr(finder, 'find_distributions')))) distros_files = chain(*(f for f in (d.files for d in distros))) distro_files = [(d, d.locate_file(f)) for d in distros if d.files for f in d.files] matching = [d for d, f in distro_files if f == target_path] for match in matching: print("Found Version:", match.version) Steve
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