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-rw-r--r--algorithms/input_kind.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/algorithms/input_kind.py b/algorithms/input_kind.py
index b91d298..68a93d8 100644
--- a/algorithms/input_kind.py
+++ b/algorithms/input_kind.py
@@ -30,4 +30,4 @@ def gen_input_for_sorting(n, case=InputKind.AVERAGE):
return _gen_input_from(sample(range(n), n))
if case is InputKind.WORST:
return _gen_input_from(range(n - 1, -1, -1))
- raise NotImplementedError("invalid input kind: " + str(case))
+ raise NotImplementedError(f"invalid input kind: {case}")