test_lockfile.py

import time
from lockfile import LockFile, LockTimeout

filepath = '/home/alex/Downloads/blah.txt'
lock = LockFile(filepath)

if lock.is_locked():
    print('Waiting to acquire the file lock...')

lock.acquire(timeout=10)

with open(filepath, 'w') as f:
    print('Acquired the file lock, now writing!')
    f.writelines(['{}'.format(time.time())])

print('sleeping to simulate a slow file operation...')
time.sleep(10)

print("Successfully updated the file, unlocking...")
lock.release()