importlib.machinery.FileFinder does a stat call to check if a path is a file if the package check failed. Now I'm willing to bet that the check is rather redundant as the file extension should be a dead give-away that something in a directory is a file and not some non-file type. The import would still fail even if this is the case in the loader when attempting to read from the file, but it happens a little later and it means finders would be more permissive in claiming they found a loader.
Does anyone see a good reason not to take the more optimistic route in the finder? As I said, the only thing I see breaking user code is if they have a directory or something named spam.py and so the finder claims it found a module when in fact it didn't and thus stopping the search for the module from continuing.
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