gh-121190: A better error message from importlib.resources.files() when module spec is None
#138531
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…es() when module spec is not available
Lib/importlib/resources/_adapters.py
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| TYPE_CHECKING = False | ||
| if TYPE_CHECKING: | ||
| from ..machinery import ModuleSpec |
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Python stdlib is not typed (that's what typeshed is for) so you'll likely be asked to revert these changes
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Yes, please revert all type annotation changes.
Lib/importlib/resources/_common.py
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| spec = wrap_spec(package) | ||
| if package.__spec__ is None: | ||
| raise TypeError(f"Can't access resources on a module with no spec: {package}") |
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I wonder is the error can be a bit more specific. I think most Python users will not know what a "spec" is? (I don't :-) )
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Thanks. I proposed a new message. wdyt?
| Adapt a package spec to adapt the underlying loader. | ||
| """ | ||
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| def __init__(self, spec, adapter=lambda spec: spec.loader): |
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Why was the default adapter removed? Isn't this a breaking change?
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For the simplicity sake, because it seems not to be used anywhere.
This default value was defined since this mechanism was introduced in #24670 but it was not used even in that commit.
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As it does not pertain to the issue that's addressed in this PR I'd recommend reverting this change anyway.
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By the way, importlib.resources module is somewhat special as its development is mainly in importlib_resources package which is then backported here, see https://github.com/python/importlib_metadata/wiki/Development-Methodology
So I am not sure if this PR should be merged here or moved over to the importlib_resources repo (CC @jaraco)
| Adapt a package spec to adapt the underlying loader. | ||
| """ | ||
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| def __init__(self, spec, adapter=lambda spec: spec.loader): |
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As it does not pertain to the issue that's addressed in this PR I'd recommend reverting this change anyway.
It can be merged here, but we prefer to merge changes in importlib_resources to make it easier to keep the code in sync. |
Co-authored-by: Daniel Hollas <danekhollas@gmail.com>
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Thank you, I created a PR to |
4 participants
importlib.resources.files(package)raises an error whenpackage.__spec__isNonebecause the code below refers tospec.namebutspecisNone.cpython/Lib/importlib/resources/_common.py
Line 117 in f19f1d8
The error would be
and #121190 said it's not helpful.
This PR adds a None-check to handle such a case and raise an error with a specific message.
(This is from PyConTW 2025 sprint)