成绩转换 的代码的实现

Problem Description
输入一个百分制的成绩t，将其转换成对应的等级，具体转换规则如下：
90~100为A;
80~89为B;
70~79为C;
60~69为D;
0~59为E;

Input
输入数据有多组，每组占一行，由一个整数组成。

Output
对于每组输入数据，输出一行。如果输入数据不在0~100范围内，请输出一行：“Score is error!”。

Sample Input
56
67
100
123

Sample Output
E
D
A
Score is error!

python

import msvcrt
global A_min
global A_max
global B_min
global B_max
global C_min
global C_max
global D_min
global D_max
global E_min
global E_max

A_min = 90
A_max = 100
B_min = 80
B_max = 89
C_min = 70
C_max = 79
D_min = 60
D_max = 69
E_min = 0
E_max = 59

scores = []
while True:
    score = input("请输入你的成绩：")
    scores.append(score)
    print('按D退出Enter继续...')
    if ord(msvcrt.getch()) in [68, 100]:
        break
for scor in scores:
    scor = int(scor)
    if A_min<=scor<=A_max:
        print('A')
    elif B_min<=scor<=B_max:
        print('B')
    elif C_min<=scor<=C_max:
        print('C')
    elif D_min<=scor<=D_max:
        print('D')
    elif E_min<=scor<=E_max:
        print('E')
    else:
        print("Score is error!")