Python file with closing automatically

Marcin Jaworski March 27, 2012 Reply

You can also do the same with locks as Lock class also implements context management protocol (it acquires lock on __enter__ and releases it on __exit__)

from threading import Lock
lock = Lock()
def somefunc():
....with lock:
........do_something_within_lock()

(sorry, I had to use dots instead of spaces to indent code because I don't know how to mark it as a code in comment here)

You can always be sure, that the code inside __exit__ method will always be invoked (just like with try-except-finally).