r =((s2-s1)/s1)*100
print('小明成绩提升了：%.1f %%'% r)
print(f'小明成绩提升了:{r:.1f}%')
print('小明成绩提升了{:.1f}%'.format(r))
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且看风吟0
r =((s2-s1)/s1)*100
print('小明成绩提升了：%.1f %%'% r)
print(f'小明成绩提升了:{r:.1f}%')
print('小明成绩提升了{:.1f}%'.format(r))