Python作业，求解答

# yzy.txt
with open('yzy.txt') as f:
    all = f.readlines()

with open('yzy.txt') as f:
    while True:
        line = f.readline()
        if not line:
            break

with open('number.txt') as f:
    data = f.readline()

data = sorted([float(i) for i in data.split(' ')])
avg = sum(data[1:-2]) / len(data[1:-2])
print(avg)