[Zope] RE: Passing namespace to Python scrict was: how to call a n external module from a Python script?

[Dieter Maurer]

Reif Peter writes:
 > ....
 > My variable is named "zone". The following Python-statement yields 1:
 > 
 > 	return namespace.has_key("zone")
 > 
 > The following calls yield an error (each one):
 > 
 > 	return namespace.items()
 > 	return namespace.keys()
 > 	return getattr(namespace, "zone")
This is all as it should be!

"namespace" was obviously passed correctly, as shown
by the success of 'namespace.has_key("zone")'.

"namespace.items" and "namespace.keys" fail because
the DTML namespace implements the mapping API only
partially: "has_key" and subscription "[...]".

The bound variables are exposed via subscription
and not as attributes. Therefore,

    'namespace["zone"]' will work while "namespace.zone"
    and the equivalent 'getattr(namespace,"zone")' will
    fail.

In some cases, you will want to use "namespace.getitem('zone')"
instead of "namespace['zone']".


Please read the "Name Lookup" and "DTML" sections of

  <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html>

Most of your problems and questions are addressed there.


Dieter