[Zope3-dev] RFC: abolishing python: expressions in ZPT TALES

[Marius Gedminas]

On Wed, Dec 28, 2005 at 12:26:13PM -0330, Rocky Burt wrote:
> Its my personal opinion that anytime a page template requires logic
> complicated enough to warrant using a 'python:' expression, that logic
> should be re-thought and placed into a view class.  I know that some
> python: expressions are fairly simple, but for an HTML designer, *any*
> python: portions are dangerous to touch (and shouldn't be touched by the
> HTML designer).
> 
> What do you all think?

+0.5

It would make the developers' job harder.  I would have to bite the
bullet and write methods for all the little 'python:foo and bar'
snippets (no boolean operations in TALES).

The most difficult part will be to change expressions like

   tal:content="python:view.someMethod(arg1, arg2)"

where arg1/arg2 come from nested tal:repeats etc. You would have to
write a view method to wrap the inner objects deep inside lists of lists
of lists.

I think in the end you would get better code, and better page templates.
"Better" here means "more readable, more maintainable, less buggy,
better tested".

Marius Gedminas
-- 
Professionalism has no place in art, and hacking is art.  Software Engineering
might be science; but that's not what I do.  I'm a hacker, not an engineer.
        -- jwz
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