[Python-Dev] 3.6.2 update: 3.6.2rc2 coming

2017-07-02 Thread Ned Deily 
As you may recall, 3.6.2rc1 was released on 2017-06-17 with an expected release 
date of 3017-06-30 for 3.6.2 final.  As you also may recall, 3.6.2rc1 was 
delayed a bit to address some security issues including updating our version of 
libexpat.  Shortly after 3.6.2rc1 was released, the expat project released 
another version of libexpat fixing another security problem.  Also since 
3.6.2rc1, fixes for several other security issues in Python 3.6 itself have 
become available and it would be better to get them out sooner rather than 
later.  Therefore, I have decided to do a second release candidate with select 
fixes cherry-picked from the 3.6 branch; continue to merge bug fixes and doc 
fixes into 3.6 as usual for release in 3.6.3.  Since there haven't been 
regressions reported so far with 3.6.2rc1, we will plan to compress the rest of 
the release cycle.  Expect to see 3.6.2rc2 available within the next couple of 
days (2017-07-04 expected) and, assuming no new issues, 3.6.2 final about a we
 ek later (around 2017-07-11).

--Ned

--
  Ned Deily
  [email protected] -- []

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[Python-Dev] 64 bit units in PyLong

2017-07-02 Thread Siyuan Ren 
The current PyLong implementation represents arbitrary precision integers
in units of 15 or 30 bits. I presume the purpose is to avoid overflow in
addition , subtraction and multiplication. But compilers these days offer
intrinsics that allow one to access the overflow flag, and to obtain the
result of 64 bit multiplication as a 128 bit number. Or at least on x86-64,
which is the dominant platform.  Any reason why it is not done? If it is
only because no one bothers, I may be able to do it.
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