Re: [Pytables-users] createTable chokes on rich-dtype structured array

[Antonio V. <ant...@ti...>]

Hi Alvaro,
thank you for reporting.

I filed an issue on GitHub to track the problem:

https://github.com/PyTables/PyTables/issues/160

ciao

Il 25/06/2012 12:03, Alvaro Tejero Cantero ha scritto:
> Hi,
>
> In view of the upcoming release I thought I'd report this because at
> the time I cannot fix it myself:
>
> I am using a structured array with a dtype specified with the
> following numpy-accepted
> format (quotation follows from
> http://docs.scipy.org/doc/numpy/reference/arrays.dtypes.html):
>
> [(field_name, field_dtype, field_shape), ...]
>
> obj should be a list of fields where each field is described by a
> tuple of length 2 or 3. (Equivalent to the descr item in the
> __array_interface__ attribute.)
>
> The first element, field_name, is the field name (if this is '' then a
> standard field name, 'f#', is assigned). The field name may also be a
> 2-tuple of strings where the first string is either a “title” (which
> may be any string or unicode string) or meta-data for the field which
> can be any object, and the second string is the “name” which must be a
> valid Python identifier.
>
> This is my concrete example:
>
> header = [(('timestamp', 't'), 'u4'),
>                 (('unit (cluster) id', 'unit'),'u2')]
>
> This is what PyTables says upon passing either the structured array or
> np.dtype(header) to the createTables function:
>
>> test.createTable('/', 'spike', s, 'test')
>
> ---------------------------------------------------------------------------
> ValueError                                Traceback (most recent call last)
> /home/tejero/Dropbox/O/ridge/doc/<ipython-input-40-5fdbd9feb41d> in <module>()
> ----> 1 test.createTable('/', 'spike', s, 'test')
>
> /home/tejero/Local/Envs/test/lib/python2.7/site-packages/tables/file.pyc
> in createTable(self, where, name, description, title, filters,
> expectedrows, chunkshape, byteorder, createparents)
>      768                      description=description, title=title,
>      769                      filters=filters, expectedrows=expectedrows,
> --> 770                      chunkshape=chunkshape, byteorder=byteorder)
>      771
>      772
>
> /home/tejero/Local/Envs/test/lib/python2.7/site-packages/tables/table.pyc
> in __init__(self, parentNode, name, description, title, filters,
> expectedrows, chunkshape, byteorder, _log)
>      805                     self._v_recarray = nparray
>      806                 self.description, self._rabyteorder = \
> --> 807                                   descr_from_dtype(nparray.dtype)
>      808
>      809         # No description yet?
>
>
> /home/tejero/Local/Envs/test/lib/python2.7/site-packages/tables/description.pyc
> in descr_from_dtype(dtype_)
>      723     fields = {}
>      724     fbyteorder = '|'
> --> 725     for (name, (dtype, pos)) in dtype_.fields.items():
>      726         kind = dtype.base.kind
>      727         byteorder = dtype.base.byteorder
>
> ValueError: too many values to unpack
>
> -á.
>
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-- 
Antonio Valentino