Can you 'break' from a Context Manager?

Question

Is there any pattern that allows you to exit from a Context Manager and return the control flow to the code following the with (...):?

For example (doesn't actually work):

with open('/etc/passwd', 'r') as f:
    f.seek(0, 2)
    if f.tell() < 10:
        print "The file is too small!"
        break

    # Process the file.

Is there anything I can replace break with to do the same thing?

Your example sounds like you want to use exceptions instead. — , Aug 06 '16 at 14:23
Couldn't you just do `if f.tell() >= 10: do stuff else: "file is too small"` here? — theorifice, Aug 06 '16 at 14:24

janbrohl · Answer 1 · 2016-08-06T15:04:48.503

it doesnt look like you can exit from with but you can wrap it in a loop so you can exit - eg like so

for _ in [0]:
    with open('/etc/passwd', 'r') as f:
        f.seek(0, 2)
        if f.tell() < 10:
            print "The file is too small!"
            break

but propably using exceptions (like mentioned in the comments) or wrapping in a function and returning (I would prefer returning) is more natural.

Can you 'break' from a Context Manager?

1 Answers1