[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 <h

[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 Assertion