string insertion in big file

Question

I have big file (few GBs) with text.

For example, it have next text:

Hello, World!

I need to insert word " funny" at 5 position, and offset the rest of text:

Hello, funny World!

How I can don't read all file for offsetting rest? Or how I can optimise this operation?

Thanks.

Answer 1

You can't. Plain text files cannot be shrunk or expanded in the beginning or middle of the file, but only at the end.

Answer 2

Well you cant, please see this for more info How do I modify a text file in Python?