8-5.py

score={"小明":89,"小红":90}
name=input("姓名":)
s=input("成绩":)
if name in score:
    if int(s)>score[name]:
        score[name]=int(s)
        print(score)
    else:
        print(score)
else:
    score[name]=int(s)
    print(score)