Antoine Pitrou <pit...@free.fr> added the comment:
In the current state of affaires this is more of a documentation issue.
Python 3 doesn't support totally unbuffered text I/O (and standard streams are
open in text mode). What `-u` and PYTHONUNBUFFERED do is that the binary layer
of standard streams is unbuffered, but the text layer is still line-buffered
(if in a tty).
"python --help" gives you an accurate description:
-u : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
see man page for details on internal buffering relating to '-u'
Also, you can try out:
python3 -u -c 'import time, sys; sys.stdout.buffer.write(b"b"); time.sleep(1);
sys.stdout.buffer.write(b"\n")'
To explicitly flush the text layer, you can use the flush() method.
----------
priority: -> normal
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8213>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
