Function callback

Lib/timeit.py:321–325

(number, time_taken)

        callback = None
        if verbose:
            def callback(number, time_taken):
                msg = "{num} loop{s} -> {secs:.{prec}g} secs"
                plural = (number != 1)
                print(msg.format(num=number, s='s' if plural else '',
                                 secs=time_taken, prec=precision))
        try:
            number, _ = t.autorange(callback)
        except: