DTML Basics (part 2) - Deeper And Deeper
(Page 7 of 8 )

For the adventurous amongst you, DTML also lets you "nest" conditionalstatements - for example, this is perfectly valid DTML code.

<dtml-if expr="day == 'Thursday'">

 <dtml-if "time == '12'>

              <dtml-if "place == 'Italy'">

                       How about some pasta for lunch?                

 </dtml-if>

 </dtml-if>

</dtml-if>

But you'll agree that is both complex and frightening. And so, inaddition to the comparison operators I've used so liberally thus far,Python also provides the "and", "or" and "not" logical operators whichallow you to group conditional expressions together. The following tableshould make this clearer.

Assume delta = 12, gamma = 12 and omega = 9



delta == gamma and delta > omega         True



delta == gamma and delta < omega         False



delta == gamma or delta < omega          True



delta > gamma or delta < omega           False



not delta           False

Given this knowledge, it's a simple matter to rewrite the example abovein terms of logical operators:

<dtml-if expr="(day == 'Thursday') and (time == '12') and (place ==

'Italy')">                        

 How about some pasta for lunch? 

</dtml-if>

Next: Submitting To The King >>
 

More Zope Articles
More By Harish Kamath, (c) Melonfire

Comments On: DTML Basics (part 2)

>>> Be the FIRST to comment on this article!