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>>> %timeit lambda:None 1000000 loops, best of 3: 311 ns per loop >>> %timeit u'1' 10000000 loops, best of 3: 80.6 ns per loop >>> %timeit 1 10000000 loops, best of 3: 38.3 ns per loop >>> %timeit '1' 10000000 loops, best of 3: 35.7 ns per loop