super naive tail -f in python

tail-f.py

#!/usr/bin/env python3

import sys
from datetime import datetime
import time
import os


def get_timestamp():
    return datetime.now().strftime("[%Y%m%d %H:%M:%S]")


def tail_f(file):
    interval = 0.01

    while 1:
        where = file.tell()
        line = file.readline()
        if not line:
            time.sleep(interval)
            file.seek(where)
        else:
            print("{} {}".format(get_timestamp(), line).strip(), end=None)
            time.sleep(interval)


if __name__ == '__main__':
    tail_f(open(sys.argv[1]))