Martin Panter added the comment:
I did some work on adding support for frozen modules, but I got stuck. The low
level is fine:
>>> pprint(sys.get_frozen_modules()) # (name, ispkg) pairs
(('_frozen_importlib', False),
('_frozen_importlib_external', False),
('__hello__', False),
('__phello__', True),
('__phello__.spam', False))
>>> print("\n".join(map(repr, pkgutil.iter_modules(builtins=True))))
(<class '_frozen_importlib.BuiltinImporter'>, '_ast', False)
. . .
(<class '_frozen_importlib.BuiltinImporter'>, 'zipimport', False)
(<class '_frozen_importlib.FrozenImporter'>, '_frozen_importlib', False)
(<class '_frozen_importlib.FrozenImporter'>, '_frozen_importlib_external',
False)
(<class '_frozen_importlib.FrozenImporter'>, '__hello__', False)
(<class '_frozen_importlib.FrozenImporter'>, '__phello__', True)
. . .
(FileFinder('.'), 'python-config', False)
. . .
But the current __hello__ and __phello__ modules print stuff when you import
them, which messes with walk_packages(), pydoc, etc:
$ ./python -m pydoc -k pkgutil
Hello world!
Hello world!
Hello world!
pkgutil - Utilities to support packages.
test.test_pkgutil
When I stopped these frozen modules from printing on import (as in my current
patch), I found this broke the test suite. In particular,
test_importlib.frozen.test_loader relies on the printouts to test what gets
executed when importing frozen modules. So I am not sure the best way to
continue if I am to add support for frozen modules to iter_modules().
Another problem was that there is no way to list submodules of a frozen package
unless you know the package’s name. Currently, iter_modules() only sees a path
list, which is empty for __phello__. However, I was able to add a special case
to walk_packages(None) to include frozen submodules.
Some questions:
1. Do people think the general idea of enhancing iter_modules() is worthwhile?
2. Should I try harder to solve the problem with running frozen modules, or is
it sensible to just leave out the frozen module support?
----------
Added file: http://bugs.python.org/file41072/iter-builtin-frozen.patch
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<http://bugs.python.org/issue25533>
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