[Zope] problem calling a Python external method in a folder from a DTML method

[Dennis Allison]

Jim -- 
Read the manual on acquisition.  I suspect that your external method 
is not in the acquisition path.  

I'd suggest an experiment to learn how it all works.  Put the 
external method in the same folder with your DTML method.  Does
it work?  Try puting the external method in the parent folder of 
the folder in which your DTML method resides.  Does
it work?  Try creating a folder in the parent call it "EM" and 
put the external method in it, and reference the external method 
as EM.M.  Does that work.  Go back to your original folder setup
and wrap the call in a <dtml-with /...../methodfolder/F> and 
reference the external method (in F) as M().  Does that work?

On Wed, 10 Mar 2004, Jim Anderson wrote:

> 
> I've had a few questions on DTML in the past week.
> This should be my last DTML question for a while
> for serveral reasones:
> 
>     1) If I can make this last example work, I'm
>         pretty sure that I can do all that I want
>         or need to do in DTML. Actually, I want
>         to do very little in DTML and quite a
>         bit in Python so I don't think I need
>         too much DTML capability.
>     2) My experiment DTML application will be
>         working once the issue below is resolved.
>     3) I plan to take the nudging toward ZPT and
>         start an experiment application in ZPT.
>         Hopefully, I will then be done with
>         DTML.
> 
> Thanks to Troy Farrell, Chris Withers, and Jonathan
> 
> I have a problem using Zope 2.7.0. I've tried Zope on
> both a Linux and Windows PC and have the same problem.
> 
> I'm working on a DTML method in which I want to
> call an external method in a folder, 'F'. F is a subdirectory
> of the directory in which the DTML resides. The method,
> 'M', is in an external module 'M.py', so the path from
> the current folder is 'F/M'. My folder has a property,
> "Sample", with a value of "Sample Text". The method,
> M, returns a string value, "M method".
> 
> First I try calling F.M()
>     <p>Calling a method</p>
>     <dtml_var expr="F.M()">
>     <p>After method call</p>
> 
> 
> 
> 
> Then I try using the dtml-with tag using F as the object
> being pushed on the stack.
> 
>     <dtml-with F only>
>         <h2>Sample: <dtml-var sample></h2>
> 
>         <p>Calling a method</p>
>         <dtml_var expr="M()">
>         <p>After method call</p>
>     </dtml-with>
> 
> 
> 
> When this DTML method is run, the output looks like:
> 
>     Calling a method
> 
>     After method call
> 
>     Sample: Sample Text
> 
>     Calling a method
> 
>     After method call
> 
> The sample property renders properly, but not the
> method output.  The output does not include the
> string returned by method, 'M'. I've experimented with
> a number of different possibilities, but I can not get
> method 'M' to run.  But I get no error messages either.
> I've tried wrapping the calls to 'M' in a dtml-try
> statement, but no exception was raised.
> 
> When I test my M.py file in the Extension directory,
> the python file executes as expected.
> 
> 
> Can anyone give me a suggestion on how to get this
> method to execute from the DTML when a dtml-call
> or dtml-var tag is used?
> 
> Jim Anderson
> 
> 
> 
> 
> 
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