python输入一批学生分数，计算平均分数，统计不及格学生人数（分数<60）如果 tNo studentsre 不是没有学生数据，则输出No students

scores = []
while True:
score = input("请输入学生分数（输入end结束）：")
if score == 'end':
break
else:
scores.append(int(score))

if len(scores) == 0:
print("No students")
else:
average_score = sum(scores) / len(scores)
print("平均分数为：", average_score)

count_fail = 0
for score in scores:
if score < 60:
count_fail += 1
print("不及格学生人数为：", count_fail)