Thanks a lot for tackling import! http://bugs.python.org/review/13959/diff/4494/16010 File Lib/imp.py (right): http://bugs.python.org/review/13959/diff/4494/16010#newcode12 Lib/imp.py:12: __all__ = ( Some tools break is __all__ is not a list. http://bugs.python.org/review/13959/diff/4494/16012 File Lib/importlib/_bootstrap.py (right): http://bugs.python.org/review/13959/diff/4494/16012#newcode1378 Lib/importlib/_bootstrap.py:1378: SOABI = "{}dm".format(TAG) Is it correct that d and m are hard-coded? IIUC they depend on configure options.