Convert Python examples to accept both python 2 and python 3

[Seth Hillbrand]

The following scripts need to be converted to allow both Python 2 and 3

pcbnew/python/examples/createFPC40.py
scripts/ddr3_length_match.py
scripts/test_plugin.py
scripts/lib_convert.py
scripts/test_kicad_plugin.py

[eelik (eelik)]

It's possible that at lest those in scripts/ are already python3 compatible. Running 2to3 (see the python documentation) reveals only print function related possible changes. "from __future__ import print_function" tells that somebody wanted to make them compatible with both 2 and 3.

[eelik (eelik)]

RefactoringTool: No changes to createFPC40.py

[eelik (eelik)]

Actually "futurize" is a better tool. It makes scripts compatible with both 2 and 3. 2to3 migrates from 2 to 3. But "__future__" found in the files is a hint about compatibility anyways. Futurize seems to want to make some changes but it doesn't necessarily mean that scripts wouldn't work in their current condition.

[KiCad Janitor (kicad-janitor)]

KiCad bug tracker has moved to Gitlab. This report is now available here: https://gitlab.com/kicad/code/kicad/-/issues/1822