Replacing text chunk in file using positions with python

Question

I have a large text file and I know the positions of the parts of the code that I would like to change. I am trying to do something similar to this:

infile = open('file.txt', 'rb')
infile.seek(start_position)
text_lenght = end_position - start_position
print(infile.read(text_lenght).upper(), file = infile)

The file is supposed to be modified in place and overwrite the previous text file. Is there a way to do this?

Hope I explained myself clear enough.

Is the data to replace the same length as the data you're overwriting? — sinback, Apr 13 '21 at 14:10
Search terms `python modify a file in place site:stackoverflow.com` produces relevant SO Q&A's. Variations of those terms should produce other useful Q&A's. — wwii, Apr 13 '21 at 14:42

score 1 · Answer 1 · edited Apr 13 '21 at 14:06

1

 infile = open('file.txt', 'r+')
 infile.seek(seek_position)
 infile.write(text_to_write)

edited Apr 13 '21 at 14:06

Dharman

26,923
21
73
125

answered Apr 13 '21 at 14:00

Kristie

74
8

Replacing text chunk in file using positions with python

1 Answers1