To All, I appreciate the range of answers and the time each of you take to think about and answer my question. Whether or not I use them I find them all educational. Thanks again.
Vincent On Mon, Oct 22, 2012 at 2:03 AM, Emile van Sebille <em...@fenx.com> wrote: > On 10/21/2012 12:06 PM, Ian Kelly wrote: > >> On Sun, Oct 21, 2012 at 12:58 PM, Vincent Davis >> <vinc...@vincentdavis.net> wrote: >> >>> x = 'apple' >>> for f in range(len(x)-1): >>> print(x[f:f+2]) >>> >>> @Ian, >>> Thanks for that I was just looking in to that. I wonder which is faster I >>> have a large set of strings to process. I'll try some timings if I get a >>> chance later today. >>> >> >> The solution you came up with is probably faster, but less general -- >> it will only work on sliceable sequences like strings, not arbitrary >> iterables. >> >> > So the simple loop is the right answer for sliceable sequences like > strings, but not if your code needs to deal with arbitrary iterables such > as those that the standard library authors are expected to handle. > > So, as OP's a self confessed newbie asking about slicing, why provide an > example requiring knowledge of tee, enumerate, next and izip? > > > def nwise(iterable, n=2): > iters = tee(iterable, n) > for i, it in enumerate(iters): > for _ in range(i): > next(it, None) > return izip(*iters) > > It's good that the standard library provides these tools as a convenience, > but when all you need is a derringer, why reach for a howitzer? > > Emile > > > -- > http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list> >
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