Eventually, yes. But if you're relying on the file being deterministically closed (e.g. if you're using the POSIX file locking mechanism) in CPython, it won't

Eventually, yes. But if you're relying on the file being deterministically closed (e.g. if you're using the POSIX file locking mechanism) in CPython, it won't necessarily be correct in non-reference counting garbage-collected languages, and the same is true if you're relying on any other sort of deterministic resource cleanup (e.g. in memory-constrained environments).