[Zope] Page Template --> tal:repeat

["Echeverria Rabi, Cristián"]

I need to do something like this

<tr tal:repeat="row python:range(value)">

But value come from another template with a form.
I always have the same error:

Error Type: TALESError
Error Value: exceptions.NameError on global name 'value' is not defined in
'', at line 14, column 5

I don't know how to solve this. I want to iterate over a sequence produced
by a python script, but I can't pass an argument to the script that came
from a form in another page.

Thanks for any help
Cristian