Re: [Python-Dev] Is file.readlines(sizehint=N) broken on 2.7?
The builtin open() was replaced with io.open().
It's difference between file.readlines() and io.IOBase.readlines().
On Sat, Apr 6, 2013 at 2:15 AM, Giampaolo Rodolà g.rod...@gmail.com wrote:
with open('test-xxx', 'w') as f:
f.write('aaa\nbbb\nccc')
with open('test-xxx', 'r') as f:
print(f.readlines(1))
On Python 3.3 I get:
['aaa\n']
...while on Python 2.7:
['aaa\n', 'bbb\n', 'ccc']
Is this a bug or I'm missing something?
--- Giampaolo
https://code.google.com/p/pyftpdlib/
https://code.google.com/p/psutil/
https://code.google.com/p/pysendfile/
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INADA Naoki songofaca...@gmail.com
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Re: [Python-Dev] Is file.readlines(sizehint=N) broken on 2.7?
2013/4/5 INADA Naoki songofaca...@gmail.com: The builtin open() was replaced with io.open(). It's difference between file.readlines() and io.IOBase.readlines(). Should that justify this difference in behavior? Apparently on 2.X sizehint does not have any effect as far as I can see. --- Giampaolo https://code.google.com/p/pyftpdlib/ https://code.google.com/p/psutil/ https://code.google.com/p/pysendfile/ ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Is file.readlines(sizehint=N) broken on 2.7?
It's a *hint*, remember? :-) It does work, it's just rounded up to a fairly large number in some implementations. On Fri, Apr 5, 2013 at 11:24 AM, Giampaolo Rodolà g.rod...@gmail.com wrote: 2013/4/5 INADA Naoki songofaca...@gmail.com: The builtin open() was replaced with io.open(). It's difference between file.readlines() and io.IOBase.readlines(). Should that justify this difference in behavior? Apparently on 2.X sizehint does not have any effect as far as I can see. --- Giampaolo https://code.google.com/p/pyftpdlib/ https://code.google.com/p/psutil/ https://code.google.com/p/pysendfile/ ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/guido%40python.org -- --Guido van Rossum (python.org/~guido) ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Is file.readlines(sizehint=N) broken on 2.7?
On Fri, 05 Apr 2013 20:24:43 +0200, =?ISO-8859-1?Q?Giampaolo_Rodol=E0?= g.rod...@gmail.com wrote: 2013/4/5 INADA Naoki songofaca...@gmail.com: The builtin open() was replaced with io.open(). It's difference between file.readlines() and io.IOBase.readlines(). Should that justify this difference in behavior? Yes. The 'file' documentation for readlines says documents that the argument is advisory and may be rounded up to an internal buffer size. io's readlines, on the other hand, says no more lines will be read if the total size of bytes read so far exceeds the hint. So, different semantics. Apparently on 2.X sizehint does not have any effect as far as I can see. Have you played with large enough hints/small enough buffers? --David ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Is file.readlines(sizehint=N) broken on 2.7?
2013/4/5 R. David Murray rdmur...@bitdance.com: On Fri, 05 Apr 2013 20:24:43 +0200, =?ISO-8859-1?Q?Giampaolo_Rodol=E0?= g.rod...@gmail.com wrote: 2013/4/5 INADA Naoki songofaca...@gmail.com: The builtin open() was replaced with io.open(). It's difference between file.readlines() and io.IOBase.readlines(). Should that justify this difference in behavior? Yes. The 'file' documentation for readlines says documents that the argument is advisory and may be rounded up to an internal buffer size. io's readlines, on the other hand, says no more lines will be read if the total size of bytes read so far exceeds the hint. So, different semantics. I see. Apparently on 2.X sizehint does not have any effect as far as I can see. Have you played with large enough hints/small enough buffers? Right, it seems it tends to change around 8196 bytes. Ok then, nevermind. --- Giampaolo https://code.google.com/p/pyftpdlib/ https://code.google.com/p/psutil/ https://code.google.com/p/pysendfile/ ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
