[ZPT] tal:repeat over the sorted keys of a dictionary

[Dieter Maurer]

Jean Jordaan wrote at 2003-7-25 11:46 +0200:
 > .. the subject says it all. I want to do something like:
 > 
 >         <ul tal:define="keys licenses/keys; sortedkeys keys/sort"
 >             tal:repeat="key sortedkeys">
 >             <li tal:content="python:licenses[key]" />
 >         </ul>
 > 
 > Unfortunately, "keys/sort" (and "python:keys.sort()") return None.
 > What am I missing?

An intermediate "dummy" assignment:

   <... tal:define="
          keys	licenses/keys;
	  dummy keys/sort;
	  "
	tal:repeat="key keys"
	...
  >

The "keys/sort" sorts "keys" as a side effect.


I do not say that side effects in templates are easy to understand.


Dieter