On Wed, Jun 19, 2002 at 08:52:38AM -0400, Guido van Rossum wrote:
> I imagine that the most common use case is a situation where the dict
> is already prepared. I think **dict is slower than a positional dict
> argument. I agree that keyword args would be useful in some cases
> where you can't trust the string.
As Barry noted, this isn't as powerful as PEP 215 (er, was that the
right number? The earlier $interpolation one, anyway) because it
doesn't allow arbitrary expressions. I'd imagine a common use case
would be to shortcut an expression without binding it to a local
variable,
"The length is ${length}".sub(length = len(someString))
In this case it would be handy to use the default environment overridden
by the new bindings, so you could do
"The length of ${someString} is ${length}".sub(length =
len(someString))
But that could get messy real fast. The idiom could be
"The length of ${someString} is ${length}".sub(someString =
someString, length = len(someString))
But that's ugly.
Joe
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