Redirection of python script output to file not working [duplicate]

Question

I have a simple python file on a Linux VM

import time
while True:
    print("test")
    time.sleep(10)

which I start with

python test.py  > test.log

but even after a longer time that file is empty

-rwxrwx--- 1 root vboxsf      0 Sep 29 07:57 test.log

Is the output cached or something? How can I make the output to go into the file right away?

I am pretty sure I forgot something very easy...

This is a LInux thing. When stdout is redirected to a file, by default it is buffered. There are several ways around it. You can add flush=True to the print call, or you can disable buffering on sys.stdout by using the -u flag when you run Python. — Tim Roberts
– Tim Roberts, Commented Sep 29, 2023 at 6:04

Alex · Accepted Answer · 2023-09-29 06:06:47Z

1

change print like below

print("test", flush=True)

Alex

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answered Sep 29, 2023 at 6:06

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