[GvR]
> But your _inst_fromkeys mutates self!
That issue wasn't intrinsic to the proposal.
The implementation should have read:
class MagicDict(dict):
def newfromkeys(obj, cls, lst, value=True):
"Returns a new MagicDict with the keys in lst set to value"
if obj is not None:
cls = obj.__class__
newobj = cls()
for elem in lst:
newobj[elem] = value
return newobj
newfromkeys = universalmethod(newfromkeys)
Universal methods give the method a way to handle the two
cases separately. This provides both the capability to make
an instance from scratch or to copy it off an existing instance.
Your example was especially compelling:
a = [3,2,1]
print a.sorted()
print list.sorted(a)
Raymond Hettinger
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