[Zope] What If It Doesn't Have a Key?

tonylabarbara at aol.com tonylabarbara at aol.com
Mon Aug 13 12:36:13 EDT 2007

I have this line of code:
<span tal:condition="python:request.has_key('checkbox_1')" tal:omit-tag="">
I would like to do the exact opposite of that. In other words, have the condition render if checkbox_1 does not exist. How do I do that?
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