[Zope] Python 101 was: simple question about <!--#if expr="fieldname = 't'"-->

[Tim Cook]

Donald Braman wrote:
> 
> It worked brilliantly untill I changed my data type from text to bool. Now
> it evaluates, but never as true.
> 
> My expression is: <dtml-if expr="bool_column == 't'">It is true</dtml-if>
> I've also tried expr="bool_column is true", "bool_column = 't'",
> "bool_column == 'true'", etc.
> 
> I've found the Python documentation on basic types and their operations, but
> still can't figure out what I'm doing wrong.

Boolean expressions that evaluate as false are: 0 (zero), None
and empty strings, lists, tuples and dictionaries.  So your
string is always true. "bool_column == ''" or "bool_column == 0 "
will eval false.

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