A Dimarts 05 Setembre 2006 15:24, vàreu escriure:
> Okay. Thank you for the efforts so far.
>
> Are you going to integrate the dtype-system into pytables? Will this
> make the current descriptions reundant, will it live side-by side or
> something else?
Good question indeed and, curiously enough, Ivan and me were discussing this
while you wrote your message. Well, to start with, we don't plan any major
change in current descriptions in PyTables 1.x series. In PyTables Pro (and
2.x) series, we have to think seriously about making dtype *the* description
type for all tables. dtype descriptor in NumPy seems comprehensive enough to
satisfy all the basic needs of PyTables, except for special datatypes
like 'Time' and 'Enum'. But, most probably, there will be a dtype descriptor
attached to each object in PyTables (at least, I'm all for it).
>
> One thing that I tend o do quite often is to iterate a number of rows
> and select a set of columns which meet some criterias on another set
> of columns; the result is delivered as an numpy recarray (or a class
> that inherits from it). It would be nice if I can build the resulting
> dtype directly from the column descriptions. Is there an easy way of
> doing this now?
Yes. You can do this from PyTables 1.2 on by doing:
mydtype = numpy.dtype(mytable.description._v_nestedDescr)
See the ``Description`` class in Users' Guide for more info on this.
Mmm, perhaps this would deserve an entry in FAQ (or an explanation in
manual)...
Cheers,
--
>0,0< Francesc Altet http://www.carabos.com/
V V Cárabos Coop. V. Enjoy Data
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