[Zope-dev] Difference between C and Python versions of TemplateDict?

[Brian Hooper]

Hi Zope-Devvers,

Anyone have experience with the below kind of problem?

I'm working on trying to make a Product which is reference-able using
an in tag, like:

<!--#in myProduct-->
  <!--#var myvalue-->
<!--#/in-->

I've made a Product along these lines:

class MyProduct(
	Acquisition.Implicit,
	Persistent,
	AccessControl.Role.RoleManager,
	OFS.SimpleItem.Item):
    def __init__(self):
        self.items = [MyItem(1), MyItem(2), MyItem(3)]

    def __call__(self, *args, **kw):
        return self.items

    def __len__(self):
        return len(self.items)

    def __getattr__(self, index):
        return self.items[index]

class MyItem:
    def __init__(self, v):
        self.myvalue = v

When I include the above <!--#in--> DTML in a document and view it, it
gives a TypeError (2 args expected instead of 1) on the following line
in DocumentTemplate.DT_In.renderwob:

	sequence=md[name]

However, the exact same code works if I change DT_Util.py so that it uses
pDocumentTemplate instead of cDocumentTemplate for the TemplateDict class
definition.  What's going on here?  Is there some difference in the way
this lookup is being done in pDocumentTemplate.TemplateDict and 
cDocumentTemplate.TemplateDict?  I'm doing my best to understand what's
going on on my own, but if anyone has an easy solution please spin it my
way!

Document Templatingly yours,
-Brian Hooper