> On Mar 16, 2019, at 02:33 , dimp...@gmail.com wrote:
>
> On Fri, Mar 15, 2019 at 10:21:48PM -0700, 'Justin C. Walker' via sage-devel
> wrote:
>>
>>> On Mar 15, 2019, at 21:46 , Ai Bo <boaisp...@gmail.com> wrote:
>>>
>>> I am running a long running program. I would like to log the output.
>>> I have tried:
>>> ../sage-8.6/sage test.sage > test.log &
>>>
>>> There is nothing written in test.log before the program finishes.
>>> I tried to use tee, same problem.
>>>
>>> I tried to add:
>>> f = open('test.log', 'w')
>>>
>>> in my test.sage program, still nothing is written before the program
>>> finishes.
>>>
>>> How to log a long running program?
>>
>> The problem, I think, is that python uses buffered output. I assume that
>> you are using print statements, so (without knowing more), I would use
>> sys.stdout.flush()
>> after each print, or after points in your program where the state is useful
>> for debugging.
>>
>> If I’ve made the wrong assumptions, let us know.
>
> I think he logs to f, so one would have to call f.flush() to flush the buffer.
Yep! Thanks for catching that.
--
Justin C. Walker
Director
Institute for the Enhancement of the Director's Income
--
Fame is fleeting, but obscurity
just drags on and on. F&E
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