Richard Jones writes:
As the subject says, REQUEST.set('n', n+1) is broken on zope.org. The following DTML will raise an AttributeError on __add__:
<dtml-call REQUEST.set('n', 1)> <dtml-call REQUEST.set('n', n+1)> There may be a simple explanation (someone else already pointed out, that you need to use "..."; I expect, you did as otherwise, you would get a "KeyError"):
There may be an object named "n" somewhere in the acquisition context. An object that does not define an "__add__" method. As you probably know (or can reread in the documentation), "REQUEST" has quite a low priority for lookups (in fact, it is at the bottom of the acquisition context). It is therefore easy to have a REQUEST definition overridden. Use "REQUEST['n']+1" instead of "n+1". Dieter