[Zope] not allowed to access a particular tuple

Jonathan dev101 at magma.ca
Fri Oct 20 09:05:32 EDT 2006

----- Original Message ----- 
From: "William Heymann" <kosh at aesaeion.com>
To: <zope at zope.org>
Sent: Friday, October 20, 2006 8:55 AM
Subject: [Zope] not allowed to access a particular tuple

> This is an external method I wrote to make it easier to iterate over the
> records returned from searching the catalog. However if I have
> yield record,item instead of yield item it says that I am not allowed to
> access a particular tuple during iteration. How can I make it so that the
> value that it yields is something that a python script object can iterate
> over? I have also tried doing yield tuple((record,item))  yield
> list(record,item)  and they give the same problem.
> How I use the script is pretty much
> for record, doc in catalogIter(context.Catalog(searchterms)):
>    print record
>    print doc
> Of course what is inside is different from that but it will cause the same
> problem since the issue happens in the iteration not inside the for loop.
> import zExceptions
> def catalogIter(records):
>    "iterate over a catalog safely"
>    for record in records:
>        try:
>            item = record.getObject()
>            if item is not None:
>                yield item
>        except (zExceptions.Unauthorized, zExceptions.NotFound, KeyError,
> AttributeError):
>            pass

The 'yield' statement is not allowed within a 'try' clause (see the Python 
Reference manual).

Why don't you just build a simple list (or list of tuples) and return that?


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