Santoso Wijaya <santoso.wij...@gmail.com> added the comment:
As for the "<memory at %p>" string, when _io.BufferedWriter prepares the byte
buffer into a PyMemoryView wrapper and passes it into the raw IO object:
res = PyObject_CallMethodObjArgs(self->raw, _PyIO_str_write, memobj, NULL);
For some reason, memobj.__repr__ is called before being passed to the raw IO's
write method.
I can't reproduce this odd behavior using a dumb raw IO that extends
_io.RawIOBase. Mimicking what pyserial does, however, reproduces both issues
(see attached).
----------
Added file: http://bugs.python.org/file22379/test_bufio.py
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<http://bugs.python.org/issue12340>
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