➜
This issue tracker has been migrated to GitHub,
and is currently read-only.
For more information,
see the GitHub FAQs in the Python's Developer Guide.
Created on 2017-02-06 07:27 by Maciej Obarski, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (2) | |||
|---|---|---|---|
| msg287089 - (view) | Author: Maciej Obarski (Maciej Obarski) | Date: 2017-02-06 07:27 | |
random.seed version=1 wont generate the same randint sequences in python2 and python3 Python 2.7: >>> seed(1); randint(0,100) 13 Python 3.6: >>> seed(1,version=1); randint(0,100) 17 The documentation states that versio=1 is "provided for reproducing random sequences from older versions of Python" and "If a new seeding method is added, then a backward compatible seeder will be offered." |
|||
| msg287094 - (view) | Author: Raymond Hettinger (rhettinger) *  |
Date: 2017-02-06 07:46 | |
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 |
|||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:42 | admin | set | github: 73644 |
| 2017-02-06 07:46:52 | rhettinger | set | status: open -> closed resolution: not a bug messages: + msg287094 stage: resolved |
| 2017-02-06 07:36:49 | rhettinger | set | assignee: rhettinger |
| 2017-02-06 07:32:28 | xiang.zhang | set | nosy:
+ rhettinger, mark.dickinson, vstinner |
| 2017-02-06 07:27:36 | Maciej Obarski | create | |