Fredrik Lundh wrote:
> duncan wrote:
>
> > What I really don't understand is why there is such pressure to get an
> > alternative interpolation added as methods to str & unicode rather than
> > just adding an interpolation module to the library?
> > e.g.
> >
> > from interpolation import sub
> > def birth(self, name):
> > country = self.countryOfOrigin['name']
> > return sub('${name} was born in ${country}', vars())
>
> that's too easy, of course ;-)
>
> especially since someone has already added such a method, a
> long time ago (os.path.expandvars).
>
> and there's already an interpolation engine in there; barry's loop,
> join and format stuff can replaced with a simple callback, and a
> call to sre.sub with the right pattern:
>
> def sub(string, mapping):
> def repl(m, mapping=mapping):
> return mapping[m.group(m.lastindex)]
> return sre.sub(A_PATTERN, repl, string)
>
> (if you like lambdas, you can turn this into a one-liner)
>
> maybe it would be sufficient to add a number of "right patterns"
> to the standard library...
FWIW, +1
holger
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