A Friday 04 December 2009 16:51:18 escriguéreu:
> Francesc,
>
> I 've tried the svn version of links pytables.
> No problem to build the package on Ubuntu 9.10 against HDF5 1.8.4 and
> python 2.5.4.
>
> The walkNodes function prints the external link.
> Perhaps it should tranparently read the linked file ...
I've thought about transparently expanding soft/external links, but decided
not to do this so that the user can still access the SoftLink/ExternalLink
object so that he can interact with them exactly like any other Node object.
Here you have an example of use:
-------------------------------------------------------------------------
import tables
# Create the external linked file first
f = tables.openFile('elink2.h5', 'w')
pep = f.createGroup('/', 'pep')
f.close()
f = tables.openFile('elink.h5', 'w')
pep = f.createGroup('/', 'pep')
elink = f.createExternalLink('/', 'pep2', 'elink2.h5:/pep')
print f
print "External Link Node-->", elink
enode = elink() # use __call__ special method for dereferring
print "Referred external node-->", enode
print "Referred external file-->", enode._v_file.filename
f.close()
--------------------------------------------------------------------------
and the output:
"""
elink.h5 (File) ''
Last modif.: 'Fri Dec 4 17:55:03 2009'
Object Tree:
/ (RootGroup) ''
/pep2 (ExternalLink) -> elink2.h5:/pep
/pep (Group) ''
External Link Node--> /pep2 (ExternalLink) -> elink2.h5:/pep
Referred external node--> /pep (Group) ''
Referred external file--> elink2.h5
"""
You can find more examples of use in the tables/tests/test_link.py file.
Cordialement,
--
Francesc Alted
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