[Zope] Simple Python question

[Ed Leafe]

<alert type="newbie">

	How do I test if a value exists in Python? I'd really like to avoid 
using try/except if possible. I need to do something like:

if defined(x):
	print 'x is cool'
else:
	print 'x does not exist'

</alert>

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  Ed Leafe
  http://leafe.com/
  http://foxcentral.net