* The 2.6-backported Mapping ABC has the 3.0 dict API,
that is, it uses keys() that returns a view etc.
Curious to hear what Guido thinks about this one.
A nice use of the Mapping ABC is to be able to
get 3.0 behaviors. I thought that was the whole
point of all these backports. If the ABC gets altered,
then it just makes the 2-to-3 conversion harder.
It's wrong if the ABC doesn't describe the behavior of actual
implementations; that is its primary purpose, the mixin class is a
nice side benefit.
ISTM, the one purpose of backporting is to make 2.6 closer to 3.0.
Altering the API will just make them further apart.
Raymond
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