[Numpy-discussion] Status of NumPy and Python 3.3

[Ronan Lamy]

Le lundi 30 juillet 2012 à 11:07 -0700, Ondřej Čertík a écrit :
> On Mon, Jul 30, 2012 at 10:04 AM, Ronan Lamy <ronan.lamy at gmail.com> wrote:
> > Le lundi 30 juillet 2012 à 17:10 +0100, Ronan Lamy a écrit :
> >> Le lundi 30 juillet 2012 à 04:57 +0100, Ronan Lamy a écrit :
> >> > Le lundi 30 juillet 2012 à 02:00 +0100, Ronan Lamy a écrit :
> >> >
> >> > >
> >> > > Anyway, I managed to compile (by blanking
> >> > > numpy/distutils/command/__init__.py) and to run the tests. I only see
> >> > > the 2 pickle errors from your latest gist. So that's all good!
> >> >
> >> > And the cause of these errors is that running the test suite somehow
> >> > corrupts Python's internal cache of bytes objects, causing the
> >> > following:
> >> > >>> b'\x01XXX'[0:1]
> >> > b'\xbb'
> >>
> >> The culprit is test_pickle_string_overwrite() in test_regression.py. The
> >> test actually tries to check for that kind of problem, but on Python 3,
> >> it only manages to trigger it without detecting it. Here's a simple way
> >> to reproduce the issue:
> >>
> >> >>> a = numpy.array([1], 'b')
> >> >>> b = pickle.loads(pickle.dumps(a))
> >> >>> b[0] = 77
> >> >>> b'\x01  '[0:1]
> >> b'M'
> >>
> >> Actually, this problem is probably quite old: I can see it in 1.6.1 w/
> >> Python 3.2.3. 3.3 only makes it more visible.
> >>
> >> I'll open an issue on GitHub ASAP.
> >>
> > https://github.com/numpy/numpy/issues/370
> 
> Thanks Ronan, nice work!
> 
> Since you looked into this -- do you know a way to fix this? (Both
> NumPy and the test.)

Pauli found out how to fix the code, so I'll try to send a PR tonight.