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

[tonylabarbara at aol.com]

Hi;
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?
TIA,
Tony
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