Unbuffered stdout/auto-flush

[Yang Zhang]

Hi, is there any way to get unbuffered stdout/stderr without relying on
the -u flag to python or calling .flush() on each print (including
indirect hacks like replacing sys.stdout with a wrapper that succeeds
each write() with a flush())? Thanks in advance!

 

[s0suk3]

Hi, is there any way to get unbuffered stdout/stderr without relying on
the -u flag to python or calling .flush() on each print (including
indirect hacks like replacing sys.stdout with a wrapper that succeeds
each write() with a flush())? Thanks in advance!

I think the only way is to reopen the stdout file descriptor:

import sys
import os

# reopen stdout file descriptor with write mode
# and 0 as the buffer size (unbuffered)
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

print "unbuffered text"

Sebastian