How to limit file size when writing one?

Question

I am using the output streams from the io module and writing to files. I want to be able to detect when I have written 1G of data to a file and then start writing to a second file. I can't seem to figure out how to determine how much data I have written to the file.

Is there something easy built in to io? Or might I have to count the bytes before each write manually?

Answer 1

if you are using this file for a logging purpose i suggest using the RotatingFileHandler in logging module like this:

import logging
import logging.handlers

file_name = 'test.log'

test_logger = logging.getLogger('Test')
handler = logging.handlers.RotatingFileHandler(file_name, maxBytes=10**9)
test_logger.addHandler(handler)

N.B: you can also use this method even if you don't use it for logging if you like doing hacks :)