python读取大文件的坑_如何在Python中读取大文件的特定部分

Given a large file (hundreds of MB) how would I use Python to quickly read the content between a specific start and end index within the file?

Essentially, I'm looking for a more efficient way of doing:

open(filename).read()[start_index:end_index]

解决方案

You can seek into the file the file and then read a certain amount from there. Seek allows you to get to a specific offset within a file, and then you can limit your read to only the number of bytes in that range.

with open(filename) as fin:

fin.seek(start_index)

data = fin.read(end_index - start_index)

That will only read that data that you're looking for.

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