[issue27261] io.BytesIO.truncate does not work as advertised

Anton Barkovsky added the comment: I'm willing to try to fix this behavior. I just want to check that this would not be considered breaking backwards compatibility. I can imagine in theory some code relying on it, but I would say that it would be relying on a bug. If some code is passed Byte

[issue27261] io.BytesIO.truncate does not work as advertised

Change by Anton Barkovsky : -- nosy: +anton.barkovsky ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https:/

[issue27261] io.BytesIO.truncate does not work as advertised

Change by Karthikeyan Singaravelan : -- nosy: +xtreak ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https:/

[issue27261] io.BytesIO.truncate does not work as advertised

Justus Winter added the comment: FWIW, I consider the documented behavior a feature. My use case is to allocate a BytesIO object with a given size, obtain a view to its buffer, and write to it from a c library. -- ___ Python tracker

[issue27261] io.BytesIO.truncate does not work as advertised

Changes by Xiang Zhang : -- nosy: +alexandre.vassalotti, serhiy.storchaka ___ Python tracker ___ ___ Python-bugs-list mailing list Uns

[issue27261] io.BytesIO.truncate does not work as advertised

Xiang Zhang added the comment: Is this a bug or a documentation matter? Inspecting BytesIO.truncate's code, it does resizing similar to list, this seems to be a designed feature, which conflicts with the documented behaviour. -- nosy: +xiang.zhang _

[issue27261] io.BytesIO.truncate does not work as advertised

Martin Panter added the comment: BytesIO is supposed to implement IOBase. I would treat this as a bug in existing versions too. -- nosy: +martin.panter stage: -> needs patch versions: +Python 2.7, Python 3.5 ___ Python tracker

[issue27261] io.BytesIO.truncate does not work as advertised

New submission from Justus Winter: % python3.6 -c "import io; b=io.BytesIO(); assert b.truncate(42) == 42; assert len(b.getbuffer()) == 42, 'expected length 42, got {}'.format(len(b.getbuffer()))" Traceback (most recent call last): File "", line 1, in AssertionError: expected length 42, got