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只要输入您的语文、数学、英语成绩，系统就会对成绩评分。

成绩评分标准（数字以成绩和为准）：

295+：A+

290~294：A

280~289：B

270~279：C

255~269：D

235~254：E

200~234：F

199-：F-

偏科程度评分标准（数字以最高成绩减去最低成绩为准）：

3-：A+

3~7：A

7~10：B

11~16：C

17~25：D

26~35：E

36~50：F

51+：F-

总评分以两个评分中最低评分为准。

源代码：

#开始进入Python的世界
while True:
    print("请输入语文成绩：")
    try:
        chinese=float(input())
    except ValueError:
        print("输入错误，请重试。")
        continue
    print("请输入数学成绩：")
    try:
        maths=float(input())
    except ValueError:
        print("输入错误，请重试")
        continue
    print("请输入英语成绩")
    try:
        english=float(input())
    except ValueError:
        print("输入错误，请重试")
        continue
    if (((chinese>=0 and chinese<=100) and (maths>=0 and maths<=100)) and (english>=0 and english<=100)):
        break
    else:
        print("输入错误，请重试")
cme=chinese+maths+english
if cme>=295:
    a=7
elif cme>=290:
    a=6
elif cme>=280:
    a=5
elif cme>=270:
    a=4
elif cme>=255:
    a=3
elif cme>=235:
    a=2
elif cme>=200:
    a=1
else:
    a=0
if chinese>=maths and chinese>=english:
    high=chinese
elif maths>=chinese and maths>=english:
    high=maths
else:
    high=english
if chinese<=maths and chinese<=english:
    low=chinese
elif maths<=chinese and maths<=english:
    low=maths
else:
    low=english
if (high-low)<=3:
    b=7
elif (high-low)<=7:
    b=6
elif (high-low)<=10:
    b=5
elif (high-low)<=16:
    b=4
elif (high-low)<=25:
    b=3
elif (high-low)<=35:
    b=2
elif (high-low)<=50:
    b=1
else:
    b=0
if a>b:
    c=b
else:
    c=a
if c is 7:
    print("A+")
elif c is 6:
    print("A")
elif c is 5:
    print("B")
elif c is 4:
    print("C")
elif c is 3:
    print("D")
elif c is 2:
    print("E")
elif c is 1:
    print("F")
else:
    print("F-")

可以将代码拷贝黏贴到海龟编辑器网页端进行测试。