re numpy, it's pretty well converted:
$ py3 Python 3.1.2 (r312:79147, May 17 2010, 21:50:36) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import numpy >>> numpy.test() Running unit tests for numpy NumPy version 2.0.0.dev8417 [... lots of output ... ] Ran 2929 tests in 15.571s OK (KNOWNFAIL=5, SKIP=4) [?]
but yeah, there's not much motivation to switch now.

Hopefully they'll pep8 the names too.