How to read a changing file in python?

Question

Python

There is a log file in which new lines constantly appear.
The task is to constantly read this file; if information appears, then it is necessary to parse it and send it further.
Only tell(), seek() and time.sleep() come to mind. Are there any better options for this?

Answer 1

https://github.com/bgreenlee/pygtail

Answer 2

1) Instead of a file, use a base on which you can hang some kind of callback for changes.
2) Either https://github.com/seb-m/pyinotify

Answer 3

Thank you, I just sketched something similar)

import time


def read_realtime(log):
    log.seek(0, 2)
    while True:
        row = log.readline()
        if not row:
            time.sleep(0.1)
            continue
        yield row

log = open("IN1511.log", "r")
log_rows = read_realtime(log)
for row in log_rows:
    print(row)