Meador Inge added the comment:
I debugged this a bit by comparing the behavior of 3.3 against 3.2. For both
cases I used the following code and debugged it in Python via pdb*:
import importlib
importlib.__import__('my_test_package')
ISTM that the difference in behavior is a result of what loader gets chosen for
the initial `import 'my_test_package'`.
With 3.2 a importlib._bootstrap._SourceFileLoader loader gets created against
'my_test_package/__init__.py'. This works fine because _SourceFileLoader fixes
up sys.modules when it loads.
With 3.3 a _frozen_importlib.ExtensionFileLoader loader gets created against
'my_test_package/__init__.so'. This doesn't work because ExtensionFileLoader
does *not* fixup sys.module when it loads.
I hope that helps some.
* Which was a real pain for 3.3 since you are debugging the frozen importlib.
You get line numbers at least, but it would be really nice if you could tell
pdb a source file to use when you are dealing with bytecode only objects and\or
you could disassemble the bytecode from pdb.
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<http://bugs.python.org/issue15623>
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