[tests][python] fix f-string in test_dask.py (#4373)

c3b9363d · Nikita Titov · GitHub · 57fc2f98 · c3b9363d
Unverified Commit c3b9363d authored Jun 12, 2021 by Nikita Titov Committed by GitHub Jun 12, 2021
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tests/python_package_test/test_dask.py tests/python_package_test/test_dask.py +1 -1

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--- a/tests/python_package_test/test_dask.py
+++ b/tests/python_package_test/test_dask.py
@@ -199,7 +199,7 @@ def _create_data(objective, n_samples=1_000, output='array', chunk_size=500, **k
        dy = da.from_array(y, chunks=chunk_size)
        dw = da.from_array(weights, chunk_size)
    else:
-        raise ValueError("Unknown output type '{output}'")
+        raise ValueError(f"Unknown output type '{output}'")

    return X, y, weights, None, dX, dy, dw, None