use f-string to fix flake8 warning #539
Merged
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Resolves a flake8 error which would manifest as a KeyError at runtime
when this exception is created.
Spotted in nightlies it took a minute to reproduce since the flake8 version we install claims to be incompatible with pyflakes 2.2.0 which was just released, which is likely why the error has the F999 code.