Python Context Managers for Reliable Resource Cleanup
Python’s with statement is more than convenient file syntax. It is a general protocol for pairing setup with guaranteed cleanup, including when code exits early or raises an exception.
Understanding context managers makes resource lifetimes visible and prevents a broad class of leaked files, locks, connections, and temporary state.
Why try/finally is the foundation Without a context manager, safe cleanup often looks like this:
Copy file = open("input.txt", encoding="utf-8") try: data = file.read() finally: file.close() The finally block runs whether the read succeeds or raises. A with statement packages that pattern:
