[Zope] error with simple python script loop

[Christian Steinhauer]

>>I tried to reproduce your '4 iteration' problem on my Zope 2.9.2 
>>installation, but even by removing the 'return' statement I 
>>still got 2 loop 
>>iterations (and 2 emails).
>>
>>I have never written a python script that did not have a 
>>'return' statement. 
>>I don't know if it is mandatory or not. I usually use python 
>>scripts as 
>>subroutines/functions and I always have a return statement  
>>(even if it is a 
>>bare return - ie. the return statement does not send back any data).
>>
>>As Andreas suggested, if you want to track this down you are 
>>going to have 
>>to use a debugger like pdb.

I have test the script on my local windows python version with an print statement, and it works fine - everytime - so its only on zope. i cant use pdb on zope´s python script i think?