Path: csiph.com!usenet.pasdenom.info!aioe.org!.POSTED!not-for-mail
From: Marco <marco_u@nsgmail.com>
Newsgroups: comp.lang.python
Subject: Built-in open() with buffering > 1
Date: Fri, 24 Aug 2012 06:35:27 +0200
Organization: Aioe.org NNTP Server
Lines: 26
Message-ID: <k170ae$vbe$1@speranza.aioe.org>
NNTP-Posting-Host: jkLVTVqcLfHLY4STqRGQsQ.user.speranza.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20120714 Thunderbird/14.0
X-Notice: Filtered by postfilter v. 0.8.2
Xref: csiph.com comp.lang.python:27777

Please, can anyone explain me the meaning of the
"buffering > 1" in the built-in open()?
The doc says: "...and an integer > 1 to indicate the size
of a fixed-size chunk buffer."
So I thought this size was the number of bytes or chars, but
it is not:

 >>> f = open('myfile', 'w', buffering=2)
 >>> f.write('a')
1
 >>> open('myfile').read()
''
 >>> f.write('b')
1
 >>> open('myfile').read()
''
 >>> f.write('cdefghi\n')
8
 >>> open('myfile').read()
''
 >>> f.flush()
 >>> open('myfile').read()
'abcdefghi\n'

Regards,
Marco