On Wed, Sep 2, 2015 at 12:45 AM, Steven D'Aprano <st...@pearwood.info> wrote: > I assume the answer is "Yes", but is it safe to expect that > tempfile.mkstemp() will only create a file that doesn't already exist? I > presume that there's no chance of it over-writing an existing file (say, > due to a race-condition).
It depends on OS support, but with that, yes, it is guaranteed to be safe; the file is opened with an exclusivity flag. Check your system's man pages for details, or here: http://linux.die.net/man/3/open O_EXCL|O_CREATE makes an "atomic file creation" operation which will fail if another process is doing the same thing. I'm not sure how mkstemp() handles that failure, but my guess/expectation is that it would pick a different file name and try again. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
