OscarL added the comment:
I can't reproduce the access violation on Windows, using Python 2.7.3.
Using the test_bufio.py script by santa4nt, I can see that the fail still
happens.
As Santoso Wijaya (santa4nt) said in a previous comment:
The `write(data)` method is getting a `memoryview` object, thus the test code
should be using `data.tobytes()` instead of using `bytes(data)`. If we
introduce that logic on the test_bufio.py script it passes.
The thing is that if we, instead of doing `import io` (the C version of the
module) we do `import _pyio as io` (the pure Python version) the FAIL does not
appears at all in the original script!
That difference ("`write` might receive a `memoryview` object if using the C
version of this module") is not documented anywhere.
It should, if that's the expected behavior [*], and the code using the io
module is responsible for using .tobytes() instead of bytes().
[*] Why "_pyio.py" behaves differently?
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<http://bugs.python.org/issue12340>
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