Does 'finally' always execute in Python?

Question

For any possible try-finally block in Python, is it guaranteed that the finally block will always be executed?

For example, let’s say I return while in an <

Answer 1

Yes. Finally always wins.

The only way to defeat it is to halt execution before finally: gets a chance to execute (e.g. crash the interpreter, turn off your computer, suspend a generator forever).

I imagine there are other scenarios I haven't thought of.

Here are a couple more you may not have thought about:

def foo():
    # finally always wins
    try:
        return 1
    finally:
        return 2

def bar():
    # even if he has to eat an unhandled exception, finally wins
    try:
        raise Exception('boom')
    finally:
        return 'no boom'

Depending on how you quit the interpreter, sometimes you can "cancel" finally, but not like this:

>>> import sys
>>> try:
...     sys.exit()
... finally:
...     print('finally wins!')
... 
finally wins!
$

Using the precarious os._exit (this falls under "crash the interpreter" in my opinion):

>>> import os
>>> try:
...     os._exit(1)
... finally:
...     print('finally!')
... 
$

I'm currently running this code, to test if finally will still execute after the heat death of the universe:

try:
    while True:
       sleep(1)
finally:
    print('done')

However, I'm still waiting on the result, so check back here later.