package python3 client on win32

[Antoine Martin]

Problem is that MSYS2 ships python 3.6 now, the version of cx_freeze that we use (the only one that works for python2) is 4.3.4... but that one does not build with python 3.5 or 3.6. Ouch.
The latest cx_freeze version 5 does produce a package, but not a usable one...

Solutions:

• fix cx_freeze 5 support (#1528) - preferred option
• find the patches to allow us to build cx_freeze 4.3.4 against python 3.5

See also:

• #640 python3 client
• #1568 python3 tracker ticket

[Ray Donnelly]

Hi Antoine, MSYS2 also ships Python 2.7 (actually 3 versions, 2 native and one msys2/cygwin-y).

[Antoine Martin]

We already use the python 2.7 from MSYS2, this ticket is about moving to python3 in time for the 3.0 release. Or at least having a usable python3 version on MS Windows.

[Antoine Martin]

• r16980: show python3 in resulting installer filename
• pynvml needs to be built by hand after calling "2to3"
• r16984: CUDA kernel location fix

See also ticket:1528#comment:9

[Antoine Martin]

• opengl works with GTK3: ticket:1569#comment:5
• non-opengl case needs fixing: windows lack decorations!
• opengl check tries to import GtkGL

Now solved:

• keyboard tool fails to import "Glib" (edit: was packaging problem?)
• gl colors gradient example needs converting to GTK3 (edit: disabled in r17005)
• webcam: opencv is missing something (edit: fixed here ticket:1483#comment:3 - but 64-bit builds still fail)

Still broken:

• running on a 64-bit system fails miserably (tried both 32-bit and 64-bit builds): the GTK3 rendering goes haywire, window decorations go AWOL, etc
• cryptography still missing

[Antoine Martin]

Some of the brokenness may be explained by the packaging? (see ticket:1528#comment:10)

[Antoine Martin]

The python3 version works at least as well as the python2 version and has the advantage of supporting transparency (just not with the opengl backend: #1682).