[Zope] DTML Example In Zope Book

[Dave]

	As a Zope newbie, I attempted to run the little DTML Method example in the 
Zope book (Chap 3 - Basic Objects). This involves creating 2 DTML Methods 
and a Python script to input some numbers and return compounding interest data.

	I basically copy-pasted the code from the book into the needed methods and 
script, but when I run it, I continually get a NameError (Zope cannot find 
a var with this name) on the first variable that the script comes to when 
running.

	For example, if I access the page as in the example, I get a NameError on 
"interest_rate". If I remove this from the picture (remove the 
"interest_rate" reference from the calculateCompoundingInterest script and 
then access the form again, I will get a NameError on the next variable it 
runs into  - this time "periods."

	I have some familiarity with Perl, but have not used Python scripting, so 
I have no idea where to start on troubleshooting this. But it appears to 
not be a script problem, but rather that the variable assignments made in 
the form thru the first DTML Method are not being passed to the script.

	Is there a syntax change that needs to be made for a newer Zope? As I 
said, I basically copy and pasted the code from the example since I am just 
beginning to learn the DTML calls. I have Zope 2.3.0 installed on a Win32 
platform.


	Thanks for any assistance!!

	- Dave