[Zope] Testing multiple values for existance - still

[Dieter Maurer]

Oliver Sturm writes:
 > I recently had the following question:
 > 
 > > I can do <dtml-if foo> to test if foo is known at all. Why can't I do
 > > <dtml-if "foo or bar"> to test if either foo or bar are known? I get a
 > > "Name Error" saying something like "global name 'foo' is not defined" if I
 > > do this (and foo is actually undefined). Is there a different syntax for
 > > this?
 > 
 > which was answered quickly by marc lindahl <marc@bowery.com> with 
 > 
 > > Try testing for existence first -- hasattr()
 > 
 > and by Steve Drees <drees@rangebroadband.com> with 
 > 
 > > <dtml-if "REQUEST.has_key('foo') or REQUEST.has_key('bar')">
Apparently, you ignored my reply.....

     <dtml-if "(_.has_key('foo') and foo) or (_.has_key('bar') and bar)">


Dieter