On Wed, Sep 11, 2013 at 06:08:25AM -0500, Skip Montanaro wrote:
> (I still don't care for the name. "Transform" != "case folding" in my
> mind. A quick scan of your links suggests most people think something
> like "cidict" or "CaseInsensitiveDict" would be more descriptive.)
But the proposal is not for a case-insensitive dict. It is more general
than that, with case-insensitivity just one specific use-case for such
a transformative dict. Arguably the most natural, or at least obvious,
such transformation, but there are others.
I have code that does something like this:
MAPPING = {'spam': 23, 'ham': 42, 'eggs': 17}
result = MAPPING[key.strip()]
# later...
answer = MAPPING[key] # Oops, forgot to strip! This is broken.
Using Antoine's proposal:
MAPPING = TransformDict(str.strip)
MAPPING.update({'spam': 23, 'ham': 42, 'eggs': 17})
result = MAPPING[key]
# later...
answer = MAPPING[key] # Fine now.
so that the mapping handles stripping the keys, not the caller.
This isn't just about strings, and certainly not just
case-insensitivity.
--
Steven
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