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Upon inspection, random.randint(a,b) does not include the endpoint b, contrary to documentation, and contrary to the argumentation in Issue7009.
To see this, run e.g.
sum(np.random.randint(0,1,1000))
which will return 0 repeatedly (statistically very unlikely). I tried both on Kubuntu 14.04/python 2.7 and pythoneverwhere.org
Within random.py, randint is (in both 2.7 and 3.5) implemented as 
def randint(self, a, b):
 """Return random integer in range [a, b], including both end points.
 """
 return self.randrange(a, b+1)
which falsely seems to include the endpoint (as randrange excludes the endpoint). However, upon running it does not.