[ZPT] Equivalent for dtml-raise?

[Brent Hendricks]

In building a custom loginForm for the LoginManager product, I've
discovered that the form must raise the 'LoginRequired' exception in
order to be displayed.  In DTML, it is done with <dtml-raise>.  I
tried <div tal:define="result python:raise('LoginRequired')"> but I
keep getting 

<!-- Page Template Diagnostics
Compilation failed
exceptions.NameError: CompilerError
-->

when I save the file.  

Does anyone have any ideas on how to do this?

Thanks,
Brent


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"The programmer, like the poet, works only slightly removed from pure
 thought-stuff.  He builds his castles in the air, from air, creating
 by exertion of the imagination.  Few media of creation are so
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                        -- Frederick Brooks, Jr., The Mythical Man Month