FWIW, I think it's generally a bad idea to depend on module.__file__ and
pkg.__path__ to find data files. Playing tricks with the contents of
pkg.__path__ apparently has its uses, but I think that (in general) it's a bad
idea as well. module.__file__ is mostly an introspective aid, and pkg.__path__
should IMO be seen as merely an implementation detail.
module.__file__: in a frozen module it will be set to "<frozen>". Expect
__file__ to be a path to a file and you're screwed.
To the lower levels of the import mechanism, the *existence* of pkg.__path__ is
all that's looked at: "hey, it's a package". Then there's freeze again: a frozen
package has a __path__ variable, but it's not a list, it's a *string*. Only when
an import goes through a sys.path item, __path__ is (more or less) guaranteed to
be a list.
The sys.meta_path import hook mechanism in my patch (the idea is stolen from
Gordon McMillan) acts on the same level as builtin module imports and frozen
module imports: it doesn't need sys.path. So it doesn't need any meaningful
object as pkg.__path__ either. I just uploaded a new version of the patch; it
now contains a test_importhooks.py script, which has a sys.meta_path test case
which actually sets pkg.__path__ to None. Works like a charm. Here's a (slightly
modified) comment from the test script:
Depending on the kind of importer, there are different
levels of freedom of what you can use as pkg.__path__.
Importer object on sys.meta_path:
it can use anything it pleases (even None), as long
as a __path__ variable is set.
Importer object on sys.path:
pkg.__path__ must be a list; it's most logical to use
an importer object as the only item. Could be the same
importer instance that imported the package itself.
A hook on sys.path_hooks:
pkg.__path__ must be a list and its only item should
be a string that the hook can handle itself.
These are just guidelines: a set of hooks could in theory
deliberately set pgk.__path__ up so submodule imports be
handled by an entirely different importer. Not sure how
useful that would be...
Just-my-2-eurocents.
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