Problem 예제.

s = 0
n = 0
with open('Score.txt','r',encoding='utf-8') as f1:
    while True:
        data = f1.readline()
        if not data: break
        s = s + int(data)
        n = n + 1
        print(data)
avg = s / n
with open('out.txt','w',encoding='utf-8') as f:
    f.write('성적 합계: {0}\n' .format(s))
    f.write('성적 평균: {0}\n' .format(avg))