Update Python 3.7 syntax to 3.8

[kloczek]

Pull request
Filter all code over pyupgrade --py38-plus.

How Has This Been Tested?
I;m using my typical packaging procedure:

• python3 -sBm build -w --no-isolation
• because I'm calling build with --no-isolation I'm using during all processes only locally installed modules
• install .whl file in </install/prefix> using installer module
• run pytest with $PYTHONPATH pointing to sitearch and sitelib inside </install/prefix>
• build is performed in env which is cut off from access to the public network (pytest is executed with -m "not network")

Checklist

• I have read CONTRIBUTING.md.
• I have added a concise human-readable description of the change to CHANGELOG.md.
• I have tested that this fix is effective or that this feature works.
• I have added docstrings to newly created methods and classes.
• I have updated the README.md and the readthedocs documentation. Or verified that this is not necessary.

[pietermarsman]

(Sorry that it took a while to respond)

Love it!

The CI/CD is failing so that is something to check out.

Only one other comment: what do you think of using f-strings everywhere? I know pyupgrade is intentionally timid when converting to f-strings, but I think it is more readable in our almost all of our cases.

[pietermarsman]

@kloczek Thanks for your contribution!

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[kloczek]

Thank you