New submission from Andrew McNabb <amcn...@mcnabbs.org>:
The following snippet behaves differently in the C IO implementation than in
the Python IO implementation:
import sys
sys.stdout.write('unicode ')
sys.stdout.buffer.write(b'bytes ')
To test this, I have created two scripts, testpyio.py (using _pyio) and
testio.py (using _io). The output is as follows:
% python3 testpyio.py
unicode bytes
% python3 testio.py
bytes unicode
%
In my opinion, the behavior exhibited by _pyio is more correct. It appears
that to get the C implementation to print the lines in the correct order, there
must be a flush in between the statements. This extra flush would create a lot
of overhead.
I am attaching the two test scripts.
The C implementation prints the output in the correct order if each write ends
with a newline.
----------
components: IO
files: testpyio.py
messages: 99496
nosy: amcnabb
severity: normal
status: open
title: TextIOWrapper Buffering Inconsistent Between _io and _pyio
type: behavior
versions: Python 3.1
Added file: http://bugs.python.org/file16248/testpyio.py
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7955>
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