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From: John Gordon <gordon@panix.com>
Newsgroups: comp.lang.python
Subject: Re: random.seed question (not reproducing same sequence)
Date: Wed, 16 Apr 2014 04:32:57 +0000 (UTC)
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In <bc918afe-4b20-46c2-ab86-de0ea3c8d456@googlegroups.com> Nick Mellor <thebalancepro@gmail.com> writes:

> In response to your question, John, all I know is that my own code doesn't
> use the random module outside of this code fragment.

Does addUpdate_special_to_cart() use any random methods?

In any case, a further test would be to strip out all the business logic
and leave only the calls to random, and see if the results still differ.

Something like this:

rnd = random.Random()
for qty in [4, 0]:
    print "qty is %s" % qty
    rnd.seed(seed)
    print "seed is %s" % seed
    for cart in range(test_size):
        print "cart is %s " % cart
        for special in range(rnd.randrange(3)):
            print "special is %s " % special
            print "stockbin is %s" % rnd.randrange(test_size)
            print "special_id is %s" % rnd.randrange(test_size)
            print "products is %s" % [(rnd.choice(PRODUCTS), rnd.choice(range(10))) for r in range(rnd.randrange(7))])

Run that code sample and see if the results differ when qty is 4 vs 0.

-- 
John Gordon         Imagine what it must be like for a real medical doctor to
gordon@panix.com    watch 'House', or a real serial killer to watch 'Dexter'.