[Zope] HOw Do I Modify A Defined Variable In TAL?

[Jonathan Mark]

Using TAL and ZPT, I would like to define a global
variable myVar, and then later on in the page 

add 1 to myVar, e.g.  myVar = myVar + 1.

How can I modify a variable in TAL? I know how to
modify a tag using REPLACE, ATTRIBUTES etc., but I
want to modify a variable that I have previously defined.

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