[Tutor] How to delete the last line from a file efficiently?

[Rohit Kumar]

Here is the efficient code than your code: 
==============CODE====================== 
lines = file('file1.txt', 'r').readlines() 
print lines 
del lines[-1] 
print lines 
file('file1.txt', 'w').writelines(lines) 
============================================ 


Please let me know if any issues. 
Regards, 
Rohit Kumar 
============== 
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----- Original Message ----- 
From: "Joson" <zhuchunml at gmail.com> 
To: Tutor at python.org 
Sent: Thursday, February 18, 2010 3:00:48 PM 
Subject: [Tutor] How to delete the last line from a file efficiently? 

Hi all, 
Now I have a text file about 1MB. Sometimes I need to remove the last line. 
The current method I use is reading all content, finding the last sentence, remove it and write the new content to the file. 
So, it need to read a 1MB file and write a 1MB file. It's ineffictient, I think. Are there any other methods? 

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