Subj : [$] Deterministic testing for multithreaded Python
To   : All
From : LWN.net
Date : Sat Sep 05 2026 06:40:09

Python's support for multithreaded programs has improved considerably over
the last few years with the advent of the "free-threaded" version of the language.  But
testing multithreaded programs is notoriously difficult, because the
underlying host system determines the thread-execution ordering, which adds
an element of non-determinism.  At PyCon US, Larry Hastings gave a talk (YouTube ;ideo)
about his blanket project,
which is meant to provide mechanisms for deterministic testing of
multithreaded Python code.

https://lwn.net/Articles/1090579/
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