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Mention hash randomization in random lib bpo-40325 #19596

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Mention hash randomization in random lib bpo-40325 #19596

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Mention hash randomization in random lib
kwikwag Apr 19, 2020
c83db2d
📜🤖 Added by blurb_it.
blurb-it[bot] Apr 19, 2020
13205a8
Update Doc/library/random.rst
kwikwag Apr 19, 2020
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5 changes: 5 additions & 0 deletions Doc/library/random.rst
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Expand Up @@ -364,6 +364,11 @@ Sometimes it is useful to be able to reproduce the sequences given by a
pseudo-random number generator. By re-using a seed value, the same sequence should be
reproducible from run to run as long as multiple threads are not running.

Hash randomization is not affected by
the :math:`~Random.seed` method. For this reason, code that relies on such salted
hashes, e.g. the ordering of :class:`set` or :class:`dict`, might be non-reproducible,
unless hash randomization is disabled or seeded (see: :envvar:`PYTHONHASHSEED`).

Most of the random module's algorithms and seeding functions are subject to
change across Python versions, but two aspects are guaranteed not to change:

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Documentation/2020-04-19-09-35-51.bpo-40325.3Y8ZeN.rst
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@@ -0,0 +1 @@
Updated :mod:`random` Notes on Reproducibility to mention hash randomization.