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Python Context Managers: contextlib.contextmanager, __exit__ Return Values, suppress, ExitStack and redirect_stdout

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Self-Hosting & Infra intermediate 5 min read $0.01 Updated 2026-10-20

Executed on Python 3.10: cleanup order, exception propagation through a generator context manager, missing try/finally skipping cleanup, contextlib.suppress, __exit__ returning True, ExitStack with several resources and output redirection.

Write correct with-statement helpers: use try/finally inside @contextmanager, know that __exit__ returning True swallows errors, combine many resources with ExitStack and capture output with redirect_stdout.

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