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diff --git a/test/functional/README.md b/test/functional/README.md
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@@ -34,7 +34,7 @@ don't have test cases for.
- When subclassing the BitcoinTestFramework, place overrides for the
`set_test_params()`, `add_options()` and `setup_xxxx()` methods at the top of
the subclass, then locally-defined helper methods, then the `run_test()` method.
-- Use `'{}'.format(x)` for string formatting, not `'%s' % x`.
+- Use `f'{x}'` for string formatting in preference to `'{}'.format(x)` or `'%s' % x`.
#### Naming guidelines