[Python-Dev] Re: Alternative Implementation for PEP 292:Simple String Substitutions (original) (raw)

Moore, Paul Paul.Moore at atosorigin.com
Fri Sep 3 17:49:59 CEST 2004

From: Barry Warsaw

Attached is a demo using the 2.4a3 implementation of string.Template. Note that the only change in the Template subclass is the pattern, and there, it's just that the 'named' and 'braced' groups got a '.' in the second character class.

Ah, I follow. The lookup logic is in the mapping class rather than in the template.

Would it be useful to factor out the "identifier syntax" bit of the pattern? The "escaped" and "bogus" groups are less likely to need changing than what constitutes an identifier.

Hmm, you'd have to get fancy then, as the "obvious" approach is a class attribute

id = "[_a-z][_a-z0-9]*"

but then computing pattern while keeping it as a class attribute is harder than I can work out right now.

Forget it - let's keep it simple until someone shows a real need.

Thanks for the sample, Paul.

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