新建文件，命名为yesterday。输入以下内容并保存。
Yesterday, all my troubles seemed so far away 昨天，一切烦恼仿佛远在天边 Now it looks as though they're here to stay 可我如今却忧心忡忡 Oh, I believe in yesterday 哦，我宁愿相信昨天 Suddenly, I'm not half the man I used to be 刹那间，我不再是从前的我 There's a shadow hanging over me. 她的身影总挥之不去 Oh, yesterday came suddenly 哦，往昔在脑海浮现 Why she had to go I don't know she wouldn't say 为何她不辞而别，姗然离去 I said something wrong, now I long for yesterday 一定是我说错了什么，我只好静静等待昨天 Yesterday, love was such an easy game to play 昨天，爱情本是如此简单 Now I need a place to hide away 我如今却渴望逃避 Oh, I believe in yesterday 哦，我宁愿相信昨天 Why she had to go I don't know she wouldn't say 为何她不辞而别，姗然离去 I said something wrong, now I long for yesterday 一定是我说错了什么，我只好静静等待昨天 Yesterday, love was such an easy game to play 昨天，爱情本是如此简单 Now I need a place to hide away 而我如今却渴望逃避 Oh, I believe in yesterday 哦，我宁愿相信昨天 Mm mm mm mm mm 嗯嗯嗯 [10]
新建Python脚本，命名为file_op.py。开始编写脚本，逐行读取yesterday文件中的内容：
f = open('yesterday','r',encoding='utf-8')
count = 0
for line in f:
if count == 9:
print('-----分割线-------')
count += 1
continue
print(line.strip())
count += 1
f.close()
执行以上脚本将逐行读取yesterday文件中的内容，不读取第10行，以分割线代替。
