supported versions policy?

[Terry Reedy]

Gary Wilson wrote:
> Does Python have a formal policy on the support lifetime (bug fixes,
> security fixes, etc.) for major and minor versions?  I did a bit of
> searching on the Python web site and this group, but didn't find
> anything.  If there is a policy posted somewhere (and I just didn't
> dig deep enough), would someone please point me in the right
> direction.  If there is no posted policy, would someone be kind enough
> to describe the practiced policy here.

Defining Pyx.y.z as Pymajor.minor.bugfix, the last normal bugfix comes 
out about the same time as the next minor. True security fixes (very 
rare) come out for a couple of years thereafter. (Exception, 3.0 support 
ended with 3.0.1 -- it should be replaced with 3.1.) Currently Py2 and 
Py3 are running in parallel. The future 2.7.z's will probably be the end 
of the Py2 series. Everything is contingent on voluteer time to do the 
above.

tjr