s1 = 72
s2 = 85
r = 100*(s2-s1)/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))
print(f'小明的成绩提高了：{r:.1f}%')
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陳大發的小红豆
s1 = 72
s2 = 85
r = 100*(s2-s1)/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))
print(f'小明的成绩提高了：{r:.1f}%')