[Numpy-discussion] Nasty bug with recarray and cPickle
James Philbin
philbinj at gmail.com
Thu Nov 6 09:53:27 EST 2008
Hi,
I might be doing something stupid so I thought i'd check here before
filing a bug report.
Firstly:
In [8]: np.__version__
Out[8]: '1.3.0.dev5883'
Basically, pickling an element from a recarray seems to break silently:
In [1]: import numpy as np
In [2]: dtype = [('r','f4'),('g','f4'),('b','f4')]
In [3]: arr = np.ones((10,), dtype=dtype)
In [4]: arr
Out[4]:
array([(1.0, 1.0, 1.0), (1.0, 1.0, 1.0), (1.0, 1.0, 1.0), (1.0, 1.0, 1.0),
(1.0, 1.0, 1.0), (1.0, 1.0, 1.0), (1.0, 1.0, 1.0), (1.0, 1.0, 1.0),
(1.0, 1.0, 1.0), (1.0, 1.0, 1.0)],
dtype=[('r', '<f4'), ('g', '<f4'), ('b', '<f4')])
In [5]: arr[0]
Out[5]: (1.0, 1.0, 1.0)
In [6]: import cPickle; cPickle.loads(cPickle.dumps(arr[0]))
Out[6]: (0.0, 0.0, 1.8643547392640242e-38)
Thanks,
James
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