Brett Cannon added the comment:
It looks like as long as you block _frozen_importlib and do a fresh import of
importlib you can make sure to use the source version of importlib._bootstrap
instead of _frozen_importlib.
>>> from test.support import import_fresh_module
>>> mod = import_fresh_module('importlib.abc', fresh=('importlib',),
>>> blocked=('_frozen_importlib',))
>>> mod
<module 'importlib.abc' from
'/Users/bcannon/Repositories/cpython/default/Lib/importlib/abc.py'>
>>> mod._bootstrap
<module 'importlib._bootstrap' from
'/Users/bcannon/Repositories/cpython/default/Lib/importlib/_bootstrap.py'>
>>> mod._frozen_importlib
>>> import importlib
>>> importlib._bootstrap
<module 'importlib._bootstrap' (frozen)>
>>> mod2 = import_fresh_module('importlib', blocked=('_frozen_importlib',))
>>> mod2
<module 'importlib' from
'/Users/bcannon/Repositories/cpython/default/Lib/importlib/__init__.py'>
>>> mod2._bootstrap
<module 'importlib._bootstrap' from
'/Users/bcannon/Repositories/cpython/default/Lib/importlib/_bootstrap.py'>
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16803>
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