[issue18975] timeit: Use thousands separators and print number of loops per second

[Antoine Pitrou]

Antoine Pitrou added the comment:

> So:
> 
>     10000 loops, best of 3: 34.6 usec per loop (28 870 loops/s)

Looks fine to me (though having a decimal space at the right and not at
the left looks a bit weird).

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<http://bugs.python.org/issue18975>
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