Just some dribble, nothing major.
I like using slices but I also noticed that a slice expression returns a new
sequence.
I sometimes find myself using them in a for loop like this:
seq = range(10)
for even in seq[::2]:
print even
(That's just for an example) But wouldn't it be a bit of a waste if the slice
expression returns a whole new list just when all you want to do in this case
is iterate over it once?
I suppose you could get around that will a little more code like:
seq = range(10)
for x in xrange(0, len(seq), 2):
print seq[x]
But it would be nice there was a way to iterate over a 'slice' of sorts, that
would act as a generator.
So I tried my handle at a little class called xslice (the x from xrange to
indicate its a generator (although I'm not sure if that's technically correct)).
With it, instead of the above example you can do:
seq = range(10)
for even in xslice(seq, 0, len(seq), 2):
print even
It would be more or less like using xrange. I know the syntax is not that much
of an improvement over just using exrange and retrieving items by index, but
it's the concept I'm looking at.
Do you think this or something like be a builtin in the future?
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