STINNER Victor <victor.stin...@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 <rep...@bugs.python.org>
<http://bugs.python.org/issue12062>
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