[Python-Dev] Dict constructor

[Tim Peters]

[Alex Martelli]
> What about the following compromise: there are two set types,
> ImmutableSet and MutableSet, with a common supertype Set.
> ...

This sounds fine to me, except I'd call them Set (mutable) and something
else <wink>.  I'd also check the code into the library now, so lots of
people can hack on it before it "becomes real".  People just won't play with
branches or sandboxes in sufficient numbers to do any collaborative good.
If Guido hates what it turns into, we can pull it out again.