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Showing content from https://mail.python.org/pipermail/python-dev/2001-March/013500.html below:

[Python-Dev] Concerns about tempfile.mktemp()

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[Matt Wilson]
> We've been auditing various code lately to check for /tmp races and so
> on.  It seems that tempfile.mktemp() is used throughout the Python
> library.  While nice and portable, tempfile.mktemp() is vulnerable to
> races.
> ...

Adding to what Guido said, the 2.1 mktemp() finally bites the bullet and uses
a mutex to ensure that no two threads (within a process) can ever generate
the same filename.  The 2.0 mktemp() was indeed subject to races in this
respect.  Freedom from cross-process races relies on using the pid in the
filename too.

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