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Date: Sun, 12 Jan 2014 10:08:31 -0500
From: "Eric S. Johansson" <esj@harvee.org>
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Subject: extracting string.Template substitution placeholders
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Xref: csiph.com comp.lang.python:63776

As part of speech recognition accessibility tools that I'm building, I'm 
using string.Template. In order to construct on-the-fly grammar, I need 
to know all of the identifiers before the template is filled in. what is 
the best way to do this?

can string.Template handle recursive expansion i.e. an identifier 
contains a template.

Thanks
--- eric