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Switch to use f-strings. (#857)

* Switch to use f-strings.

I called `pyupgrade --py3-only --py3-plus --py36-plus --py37-plus` on the Python files.
While looking through the changes, I did some adoptions to sometimes
use f-strings in places where the tool did not use them.

Additionally `pyupgrade` removed some Python 2 compatibility leftovers.

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