sum_it uninteresting

[apalala]

In koans/about_generators.py, the function sum_it is uninteresting. It would be much better if it was:

def sum_it(self, seq):
    value = 0
    for num in seq:
        # The local state of 'value' will be retained between iterations
        value += num
        yield value # the yield is now inside the for

[gregmalcolm]

Fair point, I'll add it to the to-do list

[gregmalcolm]

Fixed by icmurray.

Change is available on github and bitbucket