[issue29458] random.seed version=1 behavior

Raymond Hettinger report at bugs.python.org
Mon Feb 6 02:46:52 EST 2017


Raymond Hettinger added the comment:

Sorry Marciej, this isn't a bug.  The seeders are consistent. It is the code for randint() that has changed (to fix a minor imbalance in the distribution).  

$ python2.7 -c "from random import *; seed(1); print(repr(random()))"
0.13436424411240122
$ python3.5 -c "from random import *; seed(1); print(repr(random()))"
0.13436424411240122

The reproducibility guarantee is limited to the seeder and the output of random().  The downstream algorithms are allowed to change.  See
https://docs.python.org/3/library/random.html#notes-on-reproducibility

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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<http://bugs.python.org/issue29458>
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