Re: [Pytables-users] iterate over specific Tables

[Uwe M. <uwe...@df...>]

Hi Anthony,

On 05/19/2012 08:12 PM, Anthony Scopatz wrote:
> Why don't you try something like:
>
> bar = filter(x.description == VideoNode for x in f.walkNodes('/', 'Table'))
>
> or
>
> bar = filter(x.dtype == VideoNode._v_dtype for x in f.walkNodes('/',
> 'Table'))
>
> to compare the dtype / description directly?

Oh. *g*
This is exactly what I was looking for. I did not know how to use the 
class in a comparison for this.

Thank you!
Uwe

> On May 18, 2012 8:00 AM, "Uwe Mayer" <uwe...@df...
> <mailto:uwe...@df...>> wrote:
>
>     Hi,
>
>     I have several leaf nodes of the same table dtype:
>
>     class VideoNode(tables.IsDescription):
>         ...
>
>     Not all tables in the hdf5 file are of the same type, however. How
>     do I iterate
>     over all leafes which are tables of the above class, while ignoring
>     tables with
>     different signatures?
>
>     i.e. I'd like to write something like:
>     <code>
>     f = tables.openFile(...)
>     foo = f.walkNodes('/', classname='VideoNode')
>     </code>
>     which does not work because only the class name is "Table"...
>
>     or
>     <code>
>     bar = filter(isinstance(x, VideoNode) for x in f.walkNodes('/',
>     'Table')))
>     </code>
>
>     which does not work, because x is never an instance of VideoNode.
>
>     Any ideas?
>
>     Thanks in advance
>     Uwe
>
>
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