[Zope] Length of a list (was: [Zope] How does one display document count of a folder?)

sean@horse101.com writes:

I am using a script to display the contents of a folder, but I wonder how I might display a document count of the dtml documents in a folder? You want to get the length of a list, in your case the return value of "objectIds".

This is a FAQ: you use "_.len(<list expression>)" or (insided a dtml-in) "<dtml-var sequence-length>". Dieter