python编程写一个90分以上为A80~89分为B70~79分为C60~69分为D60分以下为E的成绩等级

score = float(input("请输入成绩: "))

if score >= 90: grade = 'A' elif score >= 80: grade = 'B' elif score >= 70: grade = 'C' elif score >= 60: grade = 'D' else: grade = 'E'

print("成绩等级为:", grade)