r = (s2-s1)/s1
print(f'小明的成绩从去年的{s1}分提升到了今年的{s2}分,成绩提升了{r:.1f}%')
s1 = 72
s2 = 85
print('小明的成绩从去年的%d分提升到了今年的%d分,提升了%.1f%%'%(s1,s2,r))
print('小明的成绩从去年的{0}分提升到了今年的{1}分,提升了{2:.1f}%'.format(s1,s2,r))
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fringe-the-end
r = (s2-s1)/s1
print(f'小明的成绩从去年的{s1}分提升到了今年的{s2}分,成绩提升了{r:.1f}%')