[Python-bugs-list] [ python-Feature Requests-764188 ] setvbuf for File object

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Feature Requests item #764188, was opened at 2003-07-01 20:21
Message generated for change (Comment added) made by yueluo
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Yue Luo (yueluo)
Assigned to: Nobody/Anonymous (nobody)
Summary: setvbuf for File object

Initial Comment:
I wonder if it is possible to add a new method setvbuf to 
File object.  The method does the same as the setvbuf() 
in stdio.h.



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>Comment By: Yue Luo (yueluo)
Date: 2003-07-29 17:04

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The -u command line option is not what I had in mind, but it
will achieve exactly what I wanted.  I just did not know
that it exists.  Maybe this request can be closed.
  
Can I use the optional bufsize to file(), open(), to change
the buffer mode of the standard output?  The stdout and
stderr are already opened.


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Comment By: Jean M. Brouwers (jbrouwers)
Date: 2003-07-29 00:27

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There is already an optional bufsize argument to file(),
open() and fdopen().  It allows you to specify unbuffered
(0), line buffered (1), system default (-1) or buffered
usage with a specific buffer size (>1).  Are you requesting
something different?

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Comment By: Martin v. Löwis (loewis)
Date: 2003-07-08 06:57

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I see. Can you explain why invoking "python -u" is insufficient?

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Comment By: Yue Luo (yueluo)
Date: 2003-07-07 23:14

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Sorry, I did not make myself clear.  I just want to be able to 
change the buffer size or the buffer mode of a file object. 
Especially, I often want to change the standard output buffer 
mode to line buffer so that I can see the result immediately 
even when the output has been redirected.

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Comment By: Martin v. Löwis (loewis)
Date: 2003-07-07 22:08

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What buf argument would you like to pass?

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