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

Guido van Rossum gvanrossum at gmail.com
Sun Aug 29 19:37:30 CEST 2004

As a test case, how would I implement the case that has come up here recently, of supporting $obj.attr substitutions, in each of the two implementations? It would be interesting to see the relative simplicity. I'm assuming that the function-based case would require effectively a cut & paste reimplementation.

[FX: Dives into source code...] The Template class is pretty trivial, but it doesn't seem to be designed for extension. Thus, the above test case would still need pretty much a rewrite. However, if the Template class was rewritten with overriding in mind, it probably could make things easier:

Subclassing is only one possibility. With the templating version, you could also write another class that implements the same interface -- very Pythonic. If Raymond's function approach were chosen, you're stuck with what that function can and can't do.

-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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