name = input('please enter your name:')s1 = int(input('%s,please enter your former grade: '%name))   #or input('{0},please enter your grade: '.format(name))s2 = int(input('%s,please enter your incumbent grade: '%name))rate = (s2-s1)/s1*100print('%s,你的成绩提升了:%.2f%%'%(name,rate))