在python中编辑文本文件中的特定行

问题描述

假设我有一个包含以下内容的文本文件：

Let's say I have a text file containing:

Dan
Warrior
500
1
0

有没有办法可以编辑该文本文件中的特定行？现在我有这个：

Is there a way I can edit a specific line in that text file? Right now I have this:

#!/usr/bin/env python
import io

myfile = open('stats.txt', 'r')
dan = myfile.readline()
print dan
print "Your name: " + dan.split('\n')[0]

try:
    myfile = open('stats.txt', 'a')
    myfile.writelines('Mage')[1]
except IOError:
        myfile.close()
finally:
        myfile.close()

是的，我知道 myfile.writelines（'Mage'）[1] 不正确。但是你明白我的观点吧？我正在尝试用Mage替换Warrior来编辑第2行。但我能做到吗？

Yes, I know that myfile.writelines('Mage')[1] is incorrect. But you get my point, right? I'm trying to edit line 2 by replacing Warrior with Mage. But can I even do that?

推荐答案

你想做这样的事情：

# with is like your try .. finally block in this case
with open('stats.txt', 'r') as file:
    # read a list of lines into data
    data = file.readlines()

print data
print "Your name: " + data[0]

# now change the 2nd line, note that you have to add a newline
data[1] = 'Mage\n'

# and write everything back
with open('stats.txt', 'w') as file:
    file.writelines( data )

原因是你无法直接在文件中执行更改第2行之类的操作。您只能覆盖（而不是删除）文件的某些部分 - 这意味着新内容仅覆盖旧内容。所以，如果你在第2行写Mage，那么结果就是'Mageior'。

The reason for this is that you can't do something like "change line 2" directly in a file. You can only overwrite (not delete) parts of a file - that means that the new content just covers the old content. So, if you wrote 'Mage' over line 2, the resulting line would be 'Mageior'.

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