Why os.environ['PYTHONUNBUFFERED'] = 'x' is not flushing prints?

Asked Feb 13 '21 at 06:03

Active Feb 13 '21 at 06:03

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python --help returns:

-u     : force the stdout and stderr streams to be unbuffered;
         this option has no effect on stdin; also PYTHONUNBUFFERED=x

So I put on start of my main.py:

if __name__ == '__main__':
    os.environ['PYTHONUNBUFFERED'] = 'x'

Why my prints are not being flushed?

The behavior is different when I use python -u main.py. This second situation flush every single print, even the ones inside packages, and tha'ts what I want.

asked Feb 13 '21 at 06:03

Leonardo Rick

3

I suspect that the variable is only checked once during startup, so setting it from within the program is too late. – jasonharper Feb 13 '21 at 06:20
I think that it is not a good idea to change value in os.environ by python, you should do it by bash – Waket Zheng Feb 13 '21 at 06:45
https://stackoverflow.com/questions/107705/disable-output-buffering btw, first link when searching for PYTHONUNBUFFERED. – Ulrich Eckhardt Feb 13 '21 at 09:06
@WaketZheng what's the consequences of doing that? How Am I supposed to do it by bash – Leonardo Rick Feb 13 '21 at 15:11
@UlrichEckhardt I saw this link but the focus of the answers follow another approach, so I maded this question to know how to make it unbuffered this way – Leonardo Rick Feb 13 '21 at 15:13

Why os.environ['PYTHONUNBUFFERED'] = 'x' is not flushing prints?

0 Answers0