帮助我，我想要你的帮助

from numpy import mean

grades_list = []
count = 0
names = locals()
students = eval(input())
for i in range(students):
    names['grades' + str(i)] = input()
    grades_list.append(float(names['grades' + str(i)]))
average = mean(grades_list)
for i in grades_list:
    if i < average:
        count += 1
print('有%s个学生低于平均分。' % count)