January 2023
Intermediate to advanced
458 pages
14h 16m
Chinese
Content preview from 可编程网络自动化
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
在网络场景中学习
Python
｜
101
4.8
处理文件
本节重点展示如何读写文件。我们只介绍基本操作，保证你随后能够轻松地挑选一本
Python
专著，继续学习文件处理的后续知识。
4.8.1
读取文件
作为示例，这里使用了一个与
Python
解释器位于相同目录的配置文件片段。
该文件名为
vlans.cfg
，内容如下所示。
vlan 10
name USERS
vlan 20
name VOICE
vlan 30
name WLAN
vlan 40
name APP
vlan 50
name WEB
vlan 60
name DB
只需要两行代码，就可以
打开
并
读取
此文件。
>>> vlans_file = open('vlans.cfg', 'r')
>>>
>>> vlans_file.read()
'vlan 10
\n
name USERS
\n
vlan 20
\n
name VOICE
\n
vlan 30
\n
name WLAN\nvlan 40\n name APP\nvlan 50\n name WEB\nvlan 60\n
name DB'
>>>
>>> vlans_file.close()
>>>
上面的例子使用文件对象的
read()
方法将全部文件读取为了
str
对象。
下面的例子会使用文件对象的
readlines()
方法读取文件，将其中的每一行保存为列表
元素。
>>> vlans_file = open('vlans.cfg', 'r')
>>>
>>> vlans_file.readlines() ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.