[Python-3000] optimizing [x]range

Tue Jul 31 12:22:56 CEST 2007

 >> if j in r:
 >> ...
 >> 
 >> Given the context, I think this is a very Obvious Way To Do It, and
 >> it's surprising that it isn't as efficient as it looks like it should
 >> be.
 Guido> Fair enough. So maybe *you* can contribute a patch?
Given the nature of this discussion and who you're asking to provide a
patch, I'd rather see a patch for this:
 Python 3.0x (py3k-struni:56553M, Jul 26 2007, 13:34:26) 
 [GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
 Type "help", "copyright", "credits" or "license" for more information.
 >>> for 0 <= i < 10 by 3:
 ... print(i)
 ...
 0
 3
 6
 9
:-) (Yes, I know the language is frozen at this point.)

Also, bringing it back more on-topic, what should the value of this
expression be?
 4 in range(0, 10, 3)
That is, are we treating range() as a set or an interval? Maybe I missed
earlier messages in this thread where this was discussed, but part of the
discussion focused on this construct
 0 <= 4 < 10
where there was no option to provide a step size. Also, this particular
notation screams out interval, not set, to me.
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