[Zope] Variable interpolation / string embedding in Python script?

[Jon Whitener]

In Zope Page Templates, you can insert a variable into a path expression 
like:

   here/folder/?id

Where 'id' is evaluated before the path expression is.  It's great for 
repeat structures.  Is there a similar mechanism for use in a Python 
Script?  Something like

   context.?id.method()

I haven't had any luck finding it, if it exists.

Thanks in advance,
Jon Whitener
Detroit Michigan USA