[ZPT] python: path(request/foo) or 0

[Martijn Pieters]

On Sun, Feb 03, 2002 at 11:02:13AM -0500, Evan Simpson wrote:
> For a while, "path('whatever')" in a Python expression would evaluate to 
> an un-raised exception if the path failed to resolve.  This exception 
> was false-valued, so the OR trick worked.  This was a Wrong Thing, and 
> caused other problems.  The proper way to do this now is:
> 
> python:path('whatever | nothing') or 0

For request variables, what also works is:

  python: request.get('varname', default)

-- 
Martijn Pieters
| Software Engineer  mailto:mj@zope.com
| Zope Corporation   http://www.zope.com/
| Creators of Zope   http://www.zope.org/
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