Use Modern Python 3 Syntax and Patterns

[mattsta]

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Description

Let's use modern style for modern code.

These changes remove python 2 syntax all over the place in favor of modern python 3 syntax first released in 2008.

Commits don't introduce any functionality changes. We're just swapping legacy syntax and practices for modern commonly accepted python practices all over the place.

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[hudeven]

@mattsta Thanks for your contribution! To move forward, would you mind signing the CLA following the instruction above?

[hudeven]

Closing as it's inactive for a while. Please feel free to reopen if there is some further progress on this PR