[Zope] evaluating a string as an expression

[Robert Rottermann]

You can do that in an external method.
(I hope there is a better answer than the on I have to offer tough)

Robert
----- Original Message -----
From: "Greg Conway" <greg@gmlnt.com>
To: "Zope@Zope. Org" <zope@zope.org>
Sent: Monday, March 04, 2002 1:19 AM
Subject: [Zope] evaluating a string as an expression


> Hi all,
>
> I'm managing (very slowly!) to ease myself from DTML to Python, but I have
> just hit a bit of a snag...
>
> I have a string of variables, such as value1, value2, value3, etc.
>
> I wish to find the values of these variables as expressions within python,
> if that makes sense!
>
> What I've done is stored these values within a form using a loop, and now
I
> need to retreive the values in python. I can see them in the request, and
> can access them via REQUEST.specify1, REQUEST.specify2, etc - but not
> programmatically!
>
> After many hours of working through this, I find (I think!) I need the
> python 'eval' command.
>
> And then I find it's not allowed in Zope!!
>
> So my question is (please somebody take pity on me!!), how can I perform
the
> following (pseudo code!!) in python?
>
> TestVar = ( 'REQUEST.specify' + str(OutsideLoop.CatID) )
>
> This doesn't work, obviously! What I really want to do is (I think)...
>
> TestVar = eval("REQUEST.specify" + str(OutsideLoop.CatID))
>
> Please, please, please can anybody offer any help on this?
>
> Regards,
>
> Greg Conway.
>
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