用于从上次读取后的文件中提取新数据的Python脚本

我正在编写python脚本以执行以下操作：-

我希望每十分钟读取一次日志文件，每次读取时，我希望提取自上次读取以来添加到文件中的任何数据（最好不必每次读取整个日志文件）。例如：-

在09:00，我阅读了日志文件，内容是：-

1. 2011-07-04 11:15:04,507 Processing request 17897931 from status 7 to 13
2. 2011-07-04 11:15:04,508 Processing request 17897931 from status 13 to 17
3. 2011-07-04 11:15:04,508 Processing request d0fcb681 from status 7 to 13
4. 2011-07-04 11:15:04,509 Processing request d0fcb681 from status 13 to 17
5. 2011-07-04 11:15:04,509 Processing request 178819a1 from status 7 to 13

1. 2011-07-04 11:15:04,507 Processing request 17897931 from status 7 to 13
2. 2011-07-04 11:15:04,508 Processing request 17897931 from status 13 to 17
3. 2011-07-04 11:15:04,508 Processing request d0fcb681 from status 7 to 13
4. 2011-07-04 11:15:04,509 Processing request d0fcb681 from status 13 to 17
5. 2011-07-04 11:15:04,509 Processing request 178819a1 from status 7 to 13
6. 2011-07-04 11:15:04,510 Processing request 178819a1 from status 13 to 17
7. 2011-07-04 11:15:04,510 Processing request 17161df1 from status 7 to 13
8. 2011-07-04 11:15:04,511 Processing request 17161df1 from status 13 to 17
9. 2011-07-04 11:15:04,511 Processing request 182013e1 from status 7 to 9

在09:10，我再次阅读了日志文件，现在内容是：-

1. 2011-07-04 11:15:04,507 Processing request 17897931 from status 7 to 13
2. 2011-07-04 11:15:04,508 Processing request 17897931 from status 13 to 17
3. 2011-07-04 11:15:04,508 Processing request d0fcb681 from status 7 to 13
4. 2011-07-04 11:15:04,509 Processing request d0fcb681 from status 13 to 17
5. 2011-07-04 11:15:04,509 Processing request 178819a1 from status 7 to 13

1. 2011-07-04 11:15:04,507 Processing request 17897931 from status 7 to 13
2. 2011-07-04 11:15:04,508 Processing request 17897931 from status 13 to 17
3. 2011-07-04 11:15:04,508 Processing request d0fcb681 from status 7 to 13
4. 2011-07-04 11:15:04,509 Processing request d0fcb681 from status 13 to 17
5. 2011-07-04 11:15:04,509 Processing request 178819a1 from status 7 to 13
6. 2011-07-04 11:15:04,510 Processing request 178819a1 from status 13 to 17
7. 2011-07-04 11:15:04,510 Processing request 17161df1 from status 7 to 13
8. 2011-07-04 11:15:04,511 Processing request 17161df1 from status 13 to 17
9. 2011-07-04 11:15:04,511 Processing request 182013e1 from status 7 to 9

我的脚本如何提取新行（第6行到第9行）

我有一个shell脚本，它已经通过使用文件的inode完成了这个任务。我正在寻找一个基于python的解决方案

我的计划是通过crontab执行脚本

你们知道我该怎么做吗

检查文件大小

等待大小更改

打开文件，搜索到以前的大小

阅读

例如：

import os, time
size = os.stat(file).st_size
time.sleep(600)
fh = open(file)
fh.seek(size)
newData = fh.read()

---

如果另一个进程同时向日志中写入内容，则此示例将不时读取部分行。我将把这个解决方案留作练习：）

嗨，卢克，谢谢你的回答。“time.sleep（600）”行的作用是什么？这是否意味着脚本总是在运行，并且每十分钟就会唤醒一次？这不能由crontab驱动吗？睡眠10分钟。您可以改用crontab，但随后必须将最后一个已知大小写入文件，以便知道下次从何处获取。