[Zope] simple var

[Jim Penny]

On Fri, Jun 14, 2002 at 02:08:58PM +0200, Paz wrote:
> I'm sorry to have to post this request, but I'm lost behind python
> syntax again.
> 
> This works:
> 
> <dtml-with "folder1.folder2"><dtml-var index_html></dtml-with>
> 
> This doesn't:
>    <dtml-call "REQUEST.set('sName', 'folder1.folder2')">
>    <dtml-with "_[sName]"><dtml-var index_html></dtml-with>

To expand on Oleg's remark in a different way --

_[sName] asks for the contents in the _ namespace of the item
whose name is given by the variable sName.

You wanted _['sName'], which is the contents in the _ namespace
of the item named 'sName'.

Note the extra level of dereferencing.  90% of the time, when you
are working with a dictionary, you want dict['someName'].  And the
other 10% of the time, you have to be sure that if you use
dict[someVariable], that variable has been assigned a valid name
of an item in the dictionary.  [Technically, this language is not
quite right, I should be talking of keys and values, 
(rather than variables and contents), but I think
the way I have said it will be easier to wrap your mind around.]

On the other hand, it would not have worked anyway, per Oleg's
explanation.

Jim Penny
> 
> Nor does:
>    <dtml-with "_.getitem(sName)"><dtml-var index_html></dtml-with>
> 
> What am I missing?
> 
> Thanks,
> Paz
> 
> 
> 
> 
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