Thx! sys.stdout.flush() works but in real use cases I cannot add
sys.stdout.flush() to every python print.
Can I do anything in the racket side to solve the problem? Making the
interactive window behave like terminal perhaps?
On Wednesday, May 20, 2020 at 4:49:30 PM UTC+8, Alex Harsanyi wrote:
>
> Short version: Try adding a "sys.stdout.flush()" after each of your print
> statements in your python script.
>
> Longer version: when you run that program in a terminal, the output is a
> TTY and the standard output is flushed after every line. When you run it
> as a subprocess, the standard output is a pipe and it is buffered.
>
> This is not Racket specific, you would get the same problem if you ran
> "os.system("test.py")" in another python program.
>
> Alex.
>
> On Wednesday, May 20, 2020 at 4:15:02 PM UTC+8, Rock Nie wrote:
>>
>> This only happens in DrRacket.
>>
>> On Wednesday, May 20, 2020 at 1:16:44 PM UTC+8, Rock Nie wrote:
>>>
>>> I am running the system procedure in drracket's interactive window
>>> (system "test.py")
>>>
>>> where test.py is
>>> #!/home/utils/Python-3.8.0/bin/python3
>>> import os
>>>
>>> print("Running cmd: date1")
>>> print("Running cmd: date2")
>>> os.system("date")
>>> print("Running cmd: date3")
>>> os.system("date")
>>>
>>> and the output is
>>> Tue May 19 22:14:19 PDT 2020
>>> Tue May 19 22:14:19 PDT 2020
>>> Running cmd: date1
>>> Running cmd: date2
>>> Running cmd: date3
>>> #t
>>>
>>> which is different from my expectation, can anyone help explain why?
>>>
>>>
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