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The gammavariate function in random.py has a wrong comment.
It says that when alpha is one it's equivalent to call expovariate(1).
We can see that is not true (see graphs) and it should be expovariate(1/beta). It's not a big deal but it can cause confusion.

I agree that the comment should be changed. While we at it, perhaps sync-up with expovariate() code and eliminate the ``u <= 1e-7`` test:
Instead of:
 elif alpha == 1.0:
 # expovariate(1)
 u = random()
 while u <= 1e-7:
 u = random()
 return -_log(u) * beta
Use this instead:
 elif alpha == 1.0:
 # expovariate(1.0 / beta)
 return -_log(1.0 - random()) * beta

This was fixed in PRs GH-1798 and GH-1934. Closing.

Does "a difference stream" in PR 1934 (news entry):
> It does however produce a difference stream of random variables than it used to.
make some sense? Sentence doesn't seem grammatical.

That should clearly have been "different stream" rather than "difference stream".