Stephen J. Turnbull, 26.02.2010 04:28:
Greg Ewing writes:
[x from stuff]
is a shorthand for
[x for x in stuff]
Any time you say "shorthand" you're probably violating TOOWTDI. :-)
Absolutely, so I would expect this to have zero change to make it in.
As a bonus, the short form could probably be made more efficient, because the tuples produced by the for-loop could be put straight into the result list, instead of having to re-pack k and v into a new tuple.
This is a straightforward optimization that should be done anyway, though, if it isn't done already.
That's a good idea. Note, however, that the item extracted from the iterable is not necessarily a tuple: >>> l = [[1,2], [3,4]] >>> [ (x,y) for (x,y) in l] [(1, 2), (3, 4)] So the tuple packing may or may not be required, but that can only be decided at runtime. Stefan