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My point was for python-2.7. I haven't stumbled into the buffer protocol yet. So no, it doesn't really.
I still think the documentation, especially the 2.7 doc, could be more explicit.
My concern here is with the use of close() becoming obscure, a second class citizen, or an afterthought. While I greatly appreciate the context manager, there are times when I want an enduring open channel for which the context manager just isn't appropriate. Even in a world with context manager, open and close need to be available and presented as a pair.
It isn't clear to me from reading the doc or looking at the examples that gzip is expected to support a close call. Yes, I concur that there is an implication, but I would prefer to see it stated explicitly along with the explicit statement that it supports an open call.