locking - What is the optimal use of a lock with a try ... except in Python 2.7? -

suppose have threading.lock() object want acquire in order use resource. suppose want use try ... except ... clause resource.

there several ways of doing this.

method 1

import threading lock = threading.lock() try:     lock:         do_stuff1()         do_stuff2() except:     do_other_stuff() 

if error occurs during do_stuff1() or do_stuff2(), lock released? or better use 1 of following methods?

method 2

with lock:     try:         do_stuff1()         do_stuff2()     except:         do_other_stuff() 

method 3

lock.acquire(): try:     do_stuff1()     do_stuff2() except:     do_other_stuff() finally:     lock.release() 

which method best lock released if error occurs?

the with "context manager" requires __exit__ method, in case ensure that, whatever happens, lock released.

if want handle exceptions occur during whatever you're doing lock, should put try inside with block, i.e. method 2 correct approach. in general, should aim minimise amount of code within try block.

you should specific possible could go wrong; bare except: bad practice (see e.g. "the evils of except"). @ very least (even simple example!) should use except exception:.