supervisor has logs breaks - python-3.6

Question

I add program which print text every 5 sec. to supervisor service and when I read a output logs there are somtimes breaks like below. Where is a problem?
I log to supervisorctrl and in this mode I :
tail test_s
and I have got sometimes breaks in report like below now I 15:06 and there is a pause
... You run test program using Supervisor at 15-02-52. Good job Darek
:). kupa4 ... You run test program using Supervisor at 15-02-57. Good
job Darek :). kupa4
... You run test program using Supervisor at 15-03-02. Good job Darek
:)
My program
#!/usr/bin/env python3.6
from datetime import datetime
import time
import sys
while True:
print(f"You run test program using Supervisor at {datetime.now().strftime('%H-%M-%S')}.")
print("Good job Darek :).")
print("...")
time.sleep(5)
His configuration in supervisor
[program:test_s]
command=/home/darek/PycharmProjects/Small_programs/shell_scripts/test/test_s.py
autostart=true
autorestart=true
stderr_logfile=/var/log/test_s.err.log
stdout_logfile=/var/log/test_s.out.log

Answer 1

It sounds like your output is being buffered. Have you tried disabling buffering?
You can do this by setting the PYTHONUNBUFFERED environment variable in your supervisord.conf file like below:
[program:test_s]
environment=PYTHONUNBUFFERED=1
command=/home/darek/PycharmProjects/Small_programs/shell_scripts/test/test_s.py
autostart=true
autorestart=true
stderr_logfile=/var/log/test_s.err.log
stdout_logfile=/var/log/test_s.out.log
Alternatively, you could run the script with the -u flag.
EDIT: If you wish to use the -u flag, you can modify your supervisord.conf like below:
command=python3 -u /home/darek/PycharmProjects/Small_programs/shell_scripts/test/test_s.py