Nathaniel Smith <n...@pobox.com> added the comment: Hmm, why did I use "unbuffered" as my term above? That's a very odd name. It's like, exactly the opposite of what we actually want. Clearly I did not think this through properly. Please pretend I said "buffer-only" instead, thanks.
> So my opinion here is that only raw IO objects (FileIO) should have this > functionality. People can build their own functionality on top of that (such > as Tornado or asyncio do with their streams). I guess I don't object to such functionality, but it would be useless to me personally. FileIO doesn't solve any problems I have with stream processing; the reason I care about this is for providing an async file I/O API. And all the async file IO APIs I know [1][2][3] have the public API of "just like regular files, but the blocking methods are async". 99% of the time, that means TextWrapper and BufferedStream. So I just don't see any way to get the advantages of this feature without either (a) adding buffer-only support to those layers, or (b) forking those layers into a 3rd-party library, and then adding buffer-only support. OTOH, it would be ok if in an initial implementation some methods like readline() simply always failed when called in buffer-only mode, since this would be a best-effort thing. (This is also a different from the non-blocking semantics discussion in bpo-13322, which is kind of scary. I don't want to deal with partial writes and reads and carrying crucial data in exceptions! I just want to know if the operation can trivially be done without blocking, and if not then I'll retry it in blocking mode.) [1] https://github.com/Tinche/aiofiles [2] https://trio.readthedocs.io/en/latest/reference-io.html#asynchronous-filesystem-i-o [3] https://curio.readthedocs.io/en/latest/reference.html#module-curio.file ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32561> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
