_socket does.  Some were using the older wsock32.lib.

PEP 328 in explaining how 'index' works.

__import__('mod', {'__packaging__': 'pkg', level=1) w/o properly (and
thus not segfaulting).

Python 3.3 thanks to importlib finishing the work in PEP 328 that
accidently got carried forward.

importlib._bootstrap is now frozen into Python/importlib.h and stored
as _frozen_importlib in sys.modules. Py_Initialize() loads the frozen
code along with sys and imp and then uses _frozen_importlib._install()
to set builtins.__import__() w/ _frozen_importlib.__import__().

Only use a single #ifdef for the 3 functions.

attributes.

Currently import does not use these attributes as they are planned
for use by importlib (which will be another commit).

Thanks to Filip Gruszczyński for the initial patch and Brian Curtin
for refining it.