Possible improvement to slice opperations.
steve at holdenweb.com
Mon Sep 5 17:44:17 CEST 2005
Scott David Daniels wrote:
> Magnus Lycka wrote:
>>>The '~' is the binary not symbol which when used
>>>with integers returns the two's compliment.
> Actually, the ~ operator is the one's complement operator.
Actually the two are exactly the same thing. Could we argue about
substantive matters, please? ;-)
> > For calculated values on the slice borders, you still
> > have -1 as end value.
> But if you are defining the from-right as ones complement,
> you use one's complement on the calculated values and
> all proceeds happily. Since this could happen in Python,
> perhaps we should call it Pythoñ.
:-) And how would that be pronounced? I understood that "ñ" would only
appear between two vowels.
>>> a[1:~1] -> center, one position from both ends.
>>This is just a convoluted way of writing a[1:-2], which
>>is exactly the same as you would write today.
It does have the merit (if you think of it as a merit) of allowing
someone to write
to remove n characters from each end of the string. Frankly I'd rather
deal with the Python that exists now than wrap my head around this
> Actually, a[1 : -1] is how you get to drop the first and
> last characters today. I suspect you knew this and were
> just a bit in a hurry criticizing a lame-brained scheme.
Yes, I've been surprised how this thread has gone on and on.
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC http://www.holdenweb.com/
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