[issue12062] Buffered I/O inconsistent with unbuffered I/O in certain cases

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

open("test.bin", "w+b", buffering=-1) creates a 
BufferedRandom object. In the _pyio module, BufferedRandom overrides the write() method to "undo readahead", whereas the _io module reuses bufferedwriter_write() for bufferedrandom_methods and bufferedwriter_methods.

I suppose that the problem is "just" that _io.BufferedRandom.write() doesn't undo readahead.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12062>
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