从文本文件中删除行？

Question

我有一个像这样的textfile.txt：

First Line
Second Line
Third Line
Fourth Line
Fifth Line
Sixth Line

如何删除最舒适的前三行和最后一行？

Answer 1

with open('textfile.txt') as old, open('newfile.txt', 'w') as new:
    lines = old.readlines()
    new.writelines(lines[3:-1])