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Since Python 3.13 (including 3.14), my custom ResourceReader is now raising errors when used withimportlib.resources.contents. This code is otherwise functioning fine from 3.8 onwards.
Traceback (most recent call last): File "D:\cpython\t.py", line 41, in <module> print(contents(FakeModule)) ~~~~~~~~^^^^^^^^^^^^ File "D:\cpython\Lib\importlib\resources\_functional.py", line 60, in contents return (resource.name for resource in _get_resource(anchor, path_names).iterdir()) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "D:\cpython\Lib\importlib\resources\_functional.py", line 81, in _get_resource return files(anchor).joinpath(*path_names) ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^TypeError: CompatibilityFiles.SpecPath.joinpath() missing 1 required positional argument: 'other'Self-contained repro below (the real one gets compiled into DLLs, so you don't want to try to debug it ;) ):
fromimportlib.abcimportLoaderfromimportlib.machineryimportModuleSpecfromimportlib.resources.abcimportResourceReader_DATA= {"FakeModule.NAME":b"hello"}_DATA_NAMES=set(_DATA)classMyReader(ResourceReader):def__init__(self,prefix):self.prefix=prefixdefopen_resource(self,resource):importioreturnio.BytesIO(_DATA[self.prefix+resource])defresource_path(self,resource):raiseFileNotFoundError()defis_resource(self,resource):returnself.prefix+resourcein_DATA_NAMESdefcontents(self):p=self.prefixlp=len(p)return (n[lp:]fornin_DATA_NAMESifn.startswith(p))classMyLoader(Loader):create_module= ...exec_module= ...defget_resource_reader(self,fullname):returnMyReader(fullname+".")classFakeModule:__loader__=MyLoader()__name__="FakeModule"__spec__=ModuleSpec(__name__,__loader__)fromimportlib.resourcesimportcontentsprint(contents(FakeModule))
(ping@jaraco)