Change file to read-only mode in Python

Question

I am writing a data processing code, in which I create a new file, write processed data in to this file and close. But the file has to be closed in read-only mode, so that i

Answer 1

This solution preserves previous permission of the file, acting like command chmod -w FILE

import os
import stat

filename = "path/to/file"
mode = os.stat(filename).st_mode
ro_mask = 0777 ^ (stat.S_IWRITE | stat.S_IWGRP | stat.S_IWOTH)
os.chmod(filename, mode & ro_mask)