[python-package] convert string concatenation to f-strings in test_engine.py (fixes #4136) #4436
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This PR proposes changes that I believe will finish the conversion of string concatenation in this project's Python code to f-strings (see #4136 (comment)).
Note to reviewers
I left a
.format()
in the construction of a model string in the diff fortest_engine.py
because it is using.format()
in a way that I couldn't figure out how to efficiently replace using f-strings. If you disagree and think it should also be removed, please leave a review saying that and I can try to figure something out.