Technical debt

[quicklizard99]

We are not in the best shape.

Dependency	Inselect	Current
Python	2.7.11	3.5.1
OpenCV	2.4.10	3.1
Qt	4.8.7	5.7

Complexities

• the PySide bindings to Qt seem to no longer be maintained and do not support Qt 5
• neither of the open source barcode readers (libdmtx and zbar) have been maintained for a long time and neither supports Python 3
• at least one fork of zbar supports Python 3 (https://github.com/Polyconseil/zbar - I have not tested the package)
• we require both 32 and 64 bit builds for Windows of zbar and of libdmtx
• PyInstaller (used to create Mac build) supports Python 3 (I have not tested this)
• cx_Freeze (used to create WIndows build) currently supports 3.4.x but not 3.5.x

Progress tracked at #399

[quicklizard99]

Previous thinking about Python 3 at #95

[quicklizard99]

The PySide2 project aims to provide a complete port of PySide to Qt 5.x.

We should perhaps look at using a shim such as https://pypi.python.org/pypi/QtPy to make it easier to switch between Qt bindings.

[quicklizard99]

ZbarLight offers bindings to zbar for Python 3. Mac OS X and Linux only - no Windows build.

[quicklizard99]

Inselect now uses pydmtxlib and pyzbar, both of which run on Python 3.

[quicklizard99]

All done