import timeit

def bench(stmt, msg=None, number=100000):
    if msg is None: msg = stmt
    best = min(timeit.repeat(stmt, number=number))
    print("%.3g\t%s" % (best * 1e6 / number, msg))

bench('str(12345)')
for s in ('', 'A', '\u0080', '\u0100', '\U00010000'):
    bench('%a.format(12345)' % (s + '{}',))
for s in ('', 'A', '\u0080', '\u0100', '\U00010000'):
    bench('%a.format(12345)' % (s + '{:-10}',))
for s in ('', 'A', '\u0080', '\u0100', '\U00010000'):
    bench('%a.format(12345)' % (s + '{:,}',))