Python百分制分数转换为五级制成绩 - 优良中及格不及格

score = int(input('请输入百分制分数：'))

if score >= 90: print('优') elif score >= 80 and score < 90: print('良') elif score >= 70 and score < 80: print('中') elif score >= 60 and score < 70: print('及格') else: print('不及格')