Re: [Pytables-users] nested tables?

[Francesc A. <fa...@ca...>]

Hi Jeff,

A Divendres 04 Novembre 2005 04:15, Jeff Whitaker va escriure:
> Is it possible to create tables with entries are themselves tables? (I
> read section 3.6 of the tutorial, but couldn't quite figure out if it
> does what I want).  Specifically, I would
> like to have a table like this:
>
> Observation =3D {
>  "id": StringCol(length=3D16)
>  "lat: Float32Col()
>  "lon": Float32Col()
>  "value": Float32Col()
>  "type": StringCol(length=3D4)
>  "qcflags": <another table whose structure depends on the value of "type">
>  }

Nope. You cannot do this sort of things. The nested capabilities of
PyTables means the you are able to create nested records in the *same*
table, not referencing other tables.

You can nevertheless add the name of the table as a string column,
like this:

Observation =3D {
 "id": StringCol(length=3D16)
 "lat: Float32Col()
 "lon": Float32Col()
 "value": Float32Col()
 "type": StringCol(length=3D4)
 "qcflags": StringCol(length=3D256)  # put here the name of the other table
}

and then, retrieve the actual table by issuing a:

for row in table:
    ...
    othertable=3Dfileh.getNode(row['qcflags'])

Cheers,

=2D-=20
>0,0<   Francesc Altet =A0 =A0 http://www.carabos.com/
V   V   C=E1rabos Coop. V. =A0=A0Enjoy Data
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