[ZPT] How do I...

[Evan Simpson]

From: "Tony McDonald" <tony.mcdonald@ncl.ac.uk>
> 1) I want to use the 'odd' path component to switch the background colour
of
> a table row.

In addition to Richard's excellent suggestion, you could do this:

<tr tal:define="odd repeat/item/odd" tal:attributes="bgcolor
python:test(odd, 'red', 'blue')"

> 2) I'd also like to call the above PageTemplate from DTML, substituting
the
> module_code='bgm' above with module_code=modcode, and pass modcode into
the
> PageTemplate.

As you've discovered, PageTemplates don't have the same sort of call
signature as Methods.  All keyword arguments are available through the
'options' variable mapping.  You can fall back to a request variable like
this:

tal:define="opt (if exists) request/module_code;opt (if exists)
options/module_code"

In the next release, if the current proposals continue to meet with
everyone's approval, you will be able to write:

tal:define="opt options/module_code | request/module_code | nothing"

...and get the argument if it is defined, else the request value if it is
defined, else nothing (None).

Cheers,

Evan @ digicool