Locking a file in Python

Question

I need to lock a file for writing in Python. It will be accessed from multiple Python processes at once. I have found some solutions online, but most fail for my purposes as

Answer 1

To add on to Evan Fossmark's answer, here's an example of how to use filelock:

from filelock import FileLock

lockfile = r"c:\scr.txt"
lock = FileLock(lockfile + ".lock")
with lock:
    file = open(path, "w")
    file.write("123")
    file.close()

Any code within the with lock: block is thread-safe, meaning that it will be finished before another process has access to the file.