> Looking over the code base, frozensets are used rarely.
> So I don't think this is warranted.
There is no shortage for perfect use cases in the form:
if urlext in {'html', 'xml', 'php'}:
. . .
If the curly braces are taken to mean a frozenset,
then the peepholer can code the whole thing as a
compile time constant. It is fast and clean.
You need not even be aware that you're using a
frozenset.
The use cases for set literals lean *heavily* toward
situtations where the set doesn't get mutated. It
would be nice if all that code got optimized down
to a compile time constant.
The cases for literals differ quite a bit from
general, dynamically formed sets. I see little
advantage for {'html', 'xml', 'php'} being mutable.
Raymond
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