[Numpy-discussion] Py3: numpy.rec.array fails with open file
Christoph Gohlke
cgohlke at uci.edu
Thu May 26 00:38:36 EDT 2011
On 5/25/2011 7:23 PM, Charles R Harris wrote:
>
>
> On Wed, May 25, 2011 at 7:29 PM, Christoph Gohlke <cgohlke at uci.edu
> <mailto:cgohlke at uci.edu>> wrote:
>
> Hello,
>
> the following code raises a ValueError on Python 3, but works as
> expected with Python 2:
>
> > >> import sys, numpy
> > >> fd = open(sys.executable, 'rb')
> > >> numpy.rec.array(fd, dtype=[('_', 'b')])
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "C:\Python32\lib\site-packages\numpy\core\records.py", line 799,
> in array
> raise ValueError("Unknown input type")
> ValueError: Unknown input type
>
>
> The problem seems to be the test for file objects in
> numpy/compat/py3k.py:
>
> def isfileobj(f):
> return isinstance(f, io.FileIO)
>
> If this is updated to include _io.BufferedReader, the type of `fd`,
> numpy.rec.array works with file objects opened in 'rb' mode:
>
> def isfileobj(f):
> return isinstance(f, (io.FileIO, io._io.BufferedReader))
>
> Tested with numpy 1.6.0 on Windows.
>
>
> Seems reasonable. Can you open a ticket and make a test for this?
>
> Chuck
>
>
Opened ticket #1843 <http://projects.scipy.org/numpy/ticket/1843> with
test case and possible fix attached.
Anyway, this is easy to work around by using numpy.rec.fromfile()
instead of numpy.rec.array().
Christoph
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