题太长，还是英文，还是截图没有文本，不写了

#!/usr/bin/python# -*- coding:utf-8 -*-def lev(num): atype = isinstance(num, (int, float, long)) if atype is True: if 90 <= num <= 100: return 'A' elif 80 <= num < 90: return 'B' elif 70 <= num < 80: return 'C' elif 60 <= num < 70: return 'D' elif num < 60: return 'E' else: return '请输入正确分数'if __name__ == '__main__': student_num,anum = input(u'请输入学生学号及考试成绩，以英文逗号相隔：') result = lev(anum) if result not in 'ABCDE': print result else: print u'学生{0}的成绩的等级是：{1}'.format(student_num, result)