Antoine Pitrou added the comment: > When a file is opened in append mode, the operating system guarantees > that all write(2) system calls atomically appended their payload to the > file.
Does it? I don't see such strong guarantees in http://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html In any case, Python 2 uses fwrite() not write(), so it may be the explanation. Do you observe the same behaviour when using io.open() instead of open()? (io.open() is the Python 3 IO stack backported to Python 2) ---------- nosy: +pitrou _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue15723> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
