switch recipe?

[Mark McEahern]

[Alex Martelli]
> I'm not sure what an lcd is in this context, but I did mean to
> loop least-common-multiple(m, n) times, treating the two sets
> as equivalent.  So I guess I had misunderstood the specs!

I seem to have a penchant for maligning concepts.  Thanks for the correction
on denominator --> multiple.  Would it make sense to say lcd (least common
denominator) is a conceptual subset of lcm (least common multiple)?  If so,
that explains my confusion.

I like your 2.3 version, especially making it handle empty setn:

> def weave(setn, setm):
>     """Return an iterator that iterates over iterator setn and
>     sequence setm until setn is exhausted.  If setn is larger than
>     setm, cycle over setm."""
>     m = len(setm)
>     if not m:
>         raise ValueError, "Set to be cycled on cannot be empty"
>     for index, item in enumerate(setn):
>         yield item, setm[index%m]

I posted a summary of all the code presented in this thread here:

  http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/139210

Thanks!

// mark

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