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devel / comp.lang.python / Re: Temporally disabling buffering

SubjectAuthor
* Temporally disabling bufferingCecil Westerhof
+* Re: Temporally disabling bufferingMarco Sulla
|`- Re: Temporally disabling bufferingCecil Westerhof
`* Re: Temporally disabling bufferingBarry
 `- Re: Temporally disabling bufferingCecil Westerhof

1
Temporally disabling buffering

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From: Cecil@decebal.nl (Cecil Westerhof)
Newsgroups: comp.lang.python
Subject: Temporally disabling buffering
Date: Thu, 31 Mar 2022 12:30:33 +0200
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 by: Cecil Westerhof - Thu, 31 Mar 2022 10:30 UTC

In Python when the output of a script is going to a pipe stdout is
buffered. When sending output to tee that is very inconvenient.

We can set PYTHONUNBUFFERED, but then stdout is always unbuffered.

On Linux we can do:
PYTHONUNBUFFERED=T script.py | tee script.log

Now the output is only unbuffered for the current run and buffered for
other runs where the output goes to a pipe.

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

Re: Temporally disabling buffering

<mailman.7.1648746182.20749.python-list@python.org>

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Subject: Re: Temporally disabling buffering
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 by: Marco Sulla - Thu, 31 Mar 2022 17:02 UTC

Dirty suggestion: stderr?

On Thu, 31 Mar 2022 at 18:38, Cecil Westerhof via Python-list
<python-list@python.org> wrote:
>
> In Python when the output of a script is going to a pipe stdout is
> buffered. When sending output to tee that is very inconvenient.
>
> We can set PYTHONUNBUFFERED, but then stdout is always unbuffered.
>
> On Linux we can do:
> PYTHONUNBUFFERED=T script.py | tee script.log
>
> Now the output is only unbuffered for the current run and buffered for
> other runs where the output goes to a pipe.
>
> --
> Cecil Westerhof
> Senior Software Engineer
> LinkedIn: http://www.linkedin.com/in/cecilwesterhof
> --
> https://mail.python.org/mailman/listinfo/python-list

Re: Temporally disabling buffering

<mailman.8.1648747432.20749.python-list@python.org>

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From: barry@barrys-emacs.org (Barry)
Newsgroups: comp.lang.python
Subject: Re: Temporally disabling buffering
Date: Thu, 31 Mar 2022 18:23:40 +0100
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 by: Barry - Thu, 31 Mar 2022 17:23 UTC

> On 31 Mar 2022, at 17:39, Cecil Westerhof via Python-list <python-list@python.org> wrote:
>
> In Python when the output of a script is going to a pipe stdout is
> buffered. When sending output to tee that is very inconvenient.
>
> We can set PYTHONUNBUFFERED, but then stdout is always unbuffered.
>
> On Linux we can do:
> PYTHONUNBUFFERED=T script.py | tee script.log
>
> Now the output is only unbuffered for the current run and buffered for
> other runs where the output goes to a pipe.

I prefer to use the -u when I run the output of python into the.

python -u script.py | tee script.log

And use py -u on windows.

Barry

>
> --
> Cecil Westerhof
> Senior Software Engineer
> LinkedIn: http://www.linkedin.com/in/cecilwesterhof
> --
> https://mail.python.org/mailman/listinfo/python-list
>

Re: Temporally disabling buffering

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From: Cecil@decebal.nl (Cecil Westerhof)
Newsgroups: comp.lang.python
Subject: Re: Temporally disabling buffering
Date: Sun, 03 Apr 2022 12:05:05 +0200
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 by: Cecil Westerhof - Sun, 3 Apr 2022 10:05 UTC

Barry <barry@barrys-emacs.org> writes:

>> On 31 Mar 2022, at 17:39, Cecil Westerhof via Python-list <python-list@python.org> wrote:
>>
>> In Python when the output of a script is going to a pipe stdout is
>> buffered. When sending output to tee that is very inconvenient.
>>
>> We can set PYTHONUNBUFFERED, but then stdout is always unbuffered.
>>
>> On Linux we can do:
>> PYTHONUNBUFFERED=T script.py | tee script.log
>>
>> Now the output is only unbuffered for the current run and buffered for
>> other runs where the output goes to a pipe.
>
> I prefer to use the -u when I run the output of python into the.
>
> python -u script.py | tee script.log

Nothing wrong with that, but I find my solution more clear.
(I also use long options instead of short ones. With df I use the
option --human-readable instead of the option -h.)

> And use py -u on windows.

Luckily I almost never have to work with Windows. ;-)

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

Re: Temporally disabling buffering

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Subject: Re: Temporally disabling buffering
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 by: Cecil Westerhof - Sun, 3 Apr 2022 10:01 UTC

Marco Sulla <Marco.Sulla.Python@gmail.com> writes:

> Dirty suggestion: stderr?

First: you have the same problem.
Second: as the name says, it is used for errors.

> On Thu, 31 Mar 2022 at 18:38, Cecil Westerhof via Python-list
> <python-list@python.org> wrote:
>>
>> In Python when the output of a script is going to a pipe stdout is
>> buffered. When sending output to tee that is very inconvenient.
>>
>> We can set PYTHONUNBUFFERED, but then stdout is always unbuffered.
>>
>> On Linux we can do:
>> PYTHONUNBUFFERED=T script.py | tee script.log
>>
>> Now the output is only unbuffered for the current run and buffered for
>> other runs where the output goes to a pipe.
>>
>> --
>> Cecil Westerhof
>> Senior Software Engineer
>> LinkedIn: http://www.linkedin.com/in/cecilwesterhof
>> --
>> https://mail.python.org/mailman/listinfo/python-list

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

devel / comp.lang.python / Re: Temporally disabling buffering

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