如何在内存有问题的大型文本文件中编辑一行

Question

所以我有一个很大的文件，有几千行，看起来像这样：

this a line
some line are long like this one
some are very longgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg like this
some are even longer than that
some are small like the line after this one
a
and this continue on for a few more thousand line

例如，我想编辑第4724行，只是从它的当前值this is a line that im using as an example到I want to edit the line into this的一个随机行。我怎么能在python中做到这一点。如果你需要更多信息，请在评论中问我。

编辑：这个文件大约是300KB，是的，我尝试过readlines()，它只返回整个文件的1/3。所以我说内存是个问题

Answer 1

根据文件的大小，在注释中给定为100KB，您应该只是天真地阅读文件并更改有问题的行。

LINE_TO_CHANGE=4724
with open('my_file.txt') as f:
lines = f.readlines()
lines[LINE_TO_CHANGE - 1] = 'edited linen'
with open('my_file.txt', 'w') as f:
f.writelines(lines)