Help with coroutine-based state machines?

[Lulu of the Lotus-Eaters]

Alan Kennedy <alanmk at hotmail.com> wrote previously:
|def squares(n):
|    for i in xrange(n):
|        yield n, n*n
|sqgen = squares(100)
|for i, sq in sqgen():
|    print "The square of %d is %d" % (i, sq)

Should be:

    def squares(n):
        for i in xrange(n):
            yield i, i*i    # <-- i
    sqgen = squares(100)
    for i, sq in sqgen:     # <-- no parens
        print "The square of %d is %d" % (i, sq)

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