lotrpy wrote:
> key = int(itemgetter(0)) is wrong, key = lambda x:int(x[0]) works.
> but s.b. told me itemgetter execute more quickly .
so you're more interested in speed than in correctness? ;-)
operator.itemgetter is a function factory that creates a *function* that
fetches the given item from a sequence. or in other words, typing
func = itemgetter(0)
is pretty much the same thing as typing
def func(seq):
return seq[0]
given this, it should be fairly obvious what int(itemgetter(0)) does: it
attemts to convert the *function* to an integer, which obviously doesn't
work.
I'd stick to the lambda form if I were you. It isn't only easier to
understand for the Python layman, it also does the right thing.
</F>
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