r = (s2/s1-1)*100
s = ('%.1f%%' % r)
print('小明本次成绩为{0},成绩提高了{1}。'.format(s1, s))
print('小明本次成绩为{0},成绩提高了{1}。'.format(s2, s))
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zhongdandong
r = (s2/s1-1)*100
s = ('%.1f%%' % r)
print('小明本次成绩为{0},成绩提高了{1}。'.format(s1, s))