Python程序：根据成绩评定等级

score = int(input('请输入你的期末考试成绩：'))

if score >= 90 and score <= 100: 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('差') elif score >= 0 and score < 60: print('不合格') else: print('你输入的数据不合理！')