[Zope] Newbie - passing a list to an External Method

[Ashley Lloyd]

I am attempting to pass a simple list of strings (say mylines=['line 
1','line 2','line 3'], generated by a Python Script) into an External 
Method, so calling it in a dtml-method:

<dtml-let 
filename="myExternalMethod(fileID='myFileName.pdf',lines=mylines)">

This external method then uses the contents of this list, and returns a 
filename.

The External Method is accepting parameters, and indeed seems to be 
accepting the list - if I change the method to return lines, and print that 
on screen (call dtml-var... instead of let filename=...), it prints ['line 
1','line 2','line 3'].

However, on attempting to view the dtml-method, I get the following error:

Error Type: AttributeError
Error Value: __getitem__
Traceback (most recent call last):<br>
  File "C:\PROGRA~1\ZopeSite\lib\python\DocumentTemplate\DT_Try.py", line 
149, in render_try_except
    result = render_blocks(self.section, md)
  File "C:\PROGRA~1\ZopeSite\lib\python\DocumentTemplate\DT_Let.py", line 
75, in render
    else: d[name]=expr(md)
  File "C:\PROGRA~1\ZopeSite\lib\python\DocumentTemplate\DT_Util.py", line 
159, in eval
    return eval(code, d)
  File "<string>", line 2, in f
  File 
"C:\PROGRA~1\ZopeSite\lib\python\Products\ExternalMethod\ExternalMethod.py", 
line 198, in __call__
    try: return apply(f,args,kw)
  File "C:\PROGRA~1\ZopeSite\Extensions\myExternalMethod.py", line 28, in 
run
    y = 20
AttributeError: __getitem__

line 28 of the External Method is:

   for line in lines:

(then attempts to use the 'line')

I am running Zope 2.5.1, Win 2k, btw.

I have tried several things, but nothing seems to work. This seems to work 
fine if the list is declared inside the External Method, but not if it is 
passed to it. Is this a feature of Zope, or of my inability? Either way, how 
can I get around it?

TIA

Ashley

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