On: Implementing Go's defer keyword in C++

[lstyls]

I know Python far better than Ruby, but it looks like the semantics are equivalent, it's just that Ruby's standard `open` implementation includes the cleanup rather than leaving it up to the caller as in Python.

[masklinn → lstyls]

One difference is that Ruby does not need a special language construct/protocol to do so.

An other is that Python's "context managers" are reified which means you can pass them around until you ultimately use them. It's a tradeoff.