Run cleanup around a custom context.
Python: Use try/finally inside a contextmanager so cleanup runs even on failure.
from contextlib import contextmanager
@contextmanager
def session():
print("open")
try:
yield "ready"
finally:
print("close")
with session() as value:
print(value)Expected output EXAMPLE
open ready close
Details
Save as snippet.py and run python3 snippet.py. Uses the Python standard library. Use try/finally inside a contextmanager so cleanup runs even on failure.
Tested on Ubuntu 24.04.5 LTS · · Python 3.12.3 · python3 3.12.3-0ubuntu2.1
Test inputs, results and environment
The exact published code ran in a dedicated Linux test container with prepared inputs. Unprivileged snippet process, external networking disabled, read-only root filesystem, and a fresh temporary working directory. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.
- Architecture / host kernel
- x86_64 / 6.18.54.1-microsoft-standard-WSL2
- Snippet identity / locale
- uid=65534, gid=65534 (unprivileged) / C.UTF-8
- Interpreter invocation
python3 -c <published code>- Container image ID
sha256:32dc2d998158b6554c99b73b533f423696a0f3e31e8cbea9db10b5eee9a2fadd- Code SHA-256
9558dc0a222f2279ceab4bb7a61dbedc0281ed5192e7b322b4937f349e064adf- Dependencies
- python3 3.12.3-0ubuntu2.1
Test input setup
These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.
# No input files required.
Observed standard output
open ready close
Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.