[Cython] Cython 0.15.1 release candidate

[Robert Bradshaw]

On Mon, Sep 19, 2011 at 9:08 PM, Yaroslav Halchenko
<lists at onerussian.com> wrote:
> is this regression or am I missing cython basics (which wouldn't be
> surprising).
>
> while testing 0.15.1 on Debian I have ran into fail-to-build-from-source
> for dipy package in Debian, failure due to error while running tests:
>
>    DM2 = pf.bundles_distances_mam(tracksA, tracksB, metric=metric)
>  File "distances.pyx", line 504, in dipy.tracking.distances.bundles_distances_mam (dipy/tracking/distances.c:5710)
> UnboundLocalError: local variable 'longest_track_lenA' referenced before assignment
>
>
> which worked fine with previous cython and looking at the dipy's .pyx
> code it seems to be ok (just an untyped cdef... no errors during 'compiling'):
>
> def bundles_distances_mam(tracksA, tracksB, metric='avg'):
>    ....
>    # preprocess tracks
>    cdef:
>        size_t longest_track_len = 0, track_len
>        longest_track_lenA, longest_track_lenB
>        cnp.ndarray[object, ndim=1] tracksA32
>        ...
>    # some code ... cut ....
>        if track_len > longest_track_lenA:
>            longest_track_lenA = track_len

See the "Incompatible changes" section of
http://wiki.cython.org/ReleaseNotes-0.15 . This change was made to be
more compatible with Python semantics. Set this variable to None if
you want to use it before you assign it to something else. (Looking at
the code, it should probably be 0 or something else, and these
variables could be typed as size_t.)

- Robert