Unbuffered stdout in python (as in python -u) from within the program
python
Solution
The best I could come up with:
>>> import os
>>> import sys
>>> unbuffered = os.fdopen(sys.stdout.fileno(), 'w', 0)
>>> unbuffered.write('test')
test>>>
>>> sys.stdout = unbuffered
>>> print 'test'
test
Tested on GNU/Linux. It seems it should work on Windows too. If I knew how to reopen sys.stdout, it would be much easier:
sys.stdout = open('???', 'w', 0)
References: http://docs.python.org/library/stdtypes.html#file-objects http://docs.python.org/library/functions.html#open http://docs.python.org/library/os.html#file-object-creation
[Edit]
Note that it would be probably better to close sys.stdout before overwriting it.
Problem
Is there any way to get the effect of running `python -u` from within my code? Failing that, can my program check if it is running in `-u` mode and exit with an error message if not? This is on Linux (Ubuntu 8.10 Server).