[Zope] object manager - getOb(...) - parameter '_marker'

[Pascal Peregrina]

If the object is not found, this raises an Exception unless you have
explicitely given a default value (in that case that value is returned).

So _marker is just used to know if a default value has been given by the
caller (and that value can be None).

Pascal


-----Message d'origine-----
De : zope-bounces at zope.org [mailto:zope-bounces at zope.org]De la part de
friedrich steindl
Envoyé : mardi 7 décembre 2004 12:47
À : zope at zope.org
Objet : [Zope] object manager - getOb(...) - parameter '_marker'


hi,

can somebody give me a hint what the parameter '_marker' is meant for in
this 
code of the zope object manager -

    def _getOb(self, id, default=_marker):
        # FIXME: what we really need to do here is ensure that only
        # sub-items are returned. That could have a measurable hit
        # on performance as things are currently implemented, so for
        # the moment we just make sure not to expose private attrs.
        if id[:1] != '_' and hasattr(aq_base(self), id):
            return getattr(self, id)
        if default is _marker:
            raise AttributeError, id
        return default


_marker ist declared as an empty list at the beginning of the module, but outside of the object manager class

... and as i believe has something to do with the path to (container of) the

object ???


thx for any hints

steindl friedrich
       (-:fs)


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