On 21/03/2017 09:43, Pavol Lisy wrote:
On 3/21/17, Kev Dwyer <kevin.p.dw...@gmail.com> wrote:
Robin Becker wrote:
Is there a way to get the same sequences of random numbers in python 2.7
and python >= 3.3?
I notice that this simple script produces different values in python 2.7
and >=3.3
C:\code\hg-repos\reportlab>cat s.py
import sys, random
print(sys.version)
random.seed(103)
for i in range(5):
print(i, random.randint(10,25))
C:\code\hg-repos\reportlab>\python27\python s.py
2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit
(AMD64)] 0 25
1 17
2 21
3 21
4 13
............
This is inspiring Robin! :)
import sys, random
print(sys.version)
def randint(a, b):
return int(random.random()*(b-a+1))+a
random.seed(103)
for i in range(5):
print(i, randint(10,25))
3.6.0 |Anaconda custom (64-bit)| (default, Dec 23 2016, 12:22:00)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]
0 25
1 17
2 21
3 21
4 13
Output seems to be same as in your 2.7 version :)
So if you are sure that sequences of random.random are same then you
could use it.
You could also save a sequence to file and use it repeatedly. (if it
is not performance problem for you)
PL.
I'm not as inspired as you; for the present I have chickened out and just
modified the 2.7 randrange method to monkeypatch the 3.x random.Random class. It
seems to be ok and allows all the test code to use random.randint, but for small
widths I think your function is correct.
--
Robin Becker
--
https://mail.python.org/mailman/listinfo/python-list
