r = (s2-s1)*100/s1 print '小明的成绩提高了%.1f %%' % r print '小明的成绩提高了{0:.1f} %'.format(r)
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r = (s2-s1)*100/s1 print '小明的成绩提高了%.1f %%' % r print '小明的成绩提高了{0:.1f} %'.format(r)