[Zope-CMF] How to read/write files from Zope??

[Lennart Regebro]

(This is not A CMF problem, so further discussion should be on 
zope at zope.org)

Sheila María wrote:
> Hi!!
>      I want to save some information of my Zope, exactly, I want to
> save the state and the Id, like lists, of my PCNG, because later
> (after to have imported and to have exported), I want to restore it.
>     Well, I've created a Python Script avec le code:
>      listIds = []
>      listStatus = []
> 
>      rows = context.pcng_catalog(meta_type="issue") 
>      for r in rows:
>              issue=r.getObject()
>              listStatus.append(issue.status())
>              listIds.append(issue.getId())
> 
> # Now, I try to write into a file
>      f = open('EstadosIdsAntesExportar', "w") 
>      f.write(listIds) 
>      f.write(listStatus) 
>      f.close()
> 
> return 1
> 
>     Well, I have an error with "f.open()", what does I have to do for
> to include it??.

You can't write to disk from Python scripts. That's a security feature, 
to prevent people with access to the webserver to change things on your 
server disk. If you have to write to a file you need to use disk based 
bython code, either a disk-based Zope product or an "external method".

However, Zope includes an import export function, maybe you can use that?

>     Too, I have seen that in Zope there is an object "File", but, how
> can I write or read to/from it??

The File object, as most Zope objects, are for things stored in the 
ZODB. So the File object is there to let you store a file (like a word 
file or a sound file) in the ZODB.