[Numpy-discussion] hashing dtypes, new variation, old theme

[Charles R Harris]

On Wed, Mar 16, 2011 at 8:46 AM, Robert Kern <robert.kern at gmail.com> wrote:

> On Wed, Mar 16, 2011 at 01:18, Matthew Brett <matthew.brett at gmail.com>
> wrote:
> > Hi,
> >
> > Running the test suite for one of our libraries, there seems to have
> > been a recent breakage of the behavior of dtype hashing.
> >
> > This script:
> >
> > import numpy as np
> >
> > data0 = np.arange(10)
> > data1 = data0 - 10
> >
> > dt0 = data0.dtype
> > dt1 = data1.dtype
> >
> > assert dt0 == dt1 # always passes
> > assert hash(dt0) == hash(dt1) # fails on latest
> >
> > fails on the current latest-ish - aada93306  and passes on a stock 1.5.0.
> >
> > Is this expected?
>
> According to "git log hashdescr.c", nothing has changed in the
> implementation of the hash function since Oct 31, before numpy 1.5.1
> which also passes the second test. I'm not sure what would be causing
> the difference in HEAD.
>
>
The 1.5.1 branch was based on 1.5.x, not master.

Chuck
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