[Python-3000] optimizing [x]range

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    >> 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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