Message 288964 - Python tracker

Here's some sample output with the change:

C:\build\cpython36>PCbuild\win32\python_d.exe
Python 3.6.0+ (3.6:95c50e5aed9e5683676e18349dd94b11901a66b3, Mar  4 2017, 06:08:54) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys._git
('CPython', '3.6', '95c50e5aed9e5683676e18349dd94b11901a66b3')

I wonder whether we should shorten the revision hash for the copyright string? I think sys._git[2] should keep the whole output.