Function follow

Solutions/8_3/cofollow.py:5–13

(filename, target)

import time

def follow(filename, target):
    with open(filename, 'r') as f:
        f.seek(0,os.SEEK_END)
        while True:
            line = f.readline()
            if line != '':
                target.send(line)
            else:
                time.sleep(0.1)

# Decorator for coroutines
from functools import wraps