[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

test_min_cost_string_conversion.py

@@ -1,17 +1,27 @@
 import pytest
-from strings.min_cost_string_conversion import compute_transform_tables, assemble_transformation
+from strings.min_cost_string_conversion import (
+    compute_transform_tables,
+    assemble_transformation,
+)
+
 
 def test_empty_strings():
-    costs, ops = compute_transform_tables("", "", 1,1,1,1)
+    costs, ops = compute_transform_tables("", "", 1, 1, 1, 1)
     assert costs == [[0]]
     assert assemble_transformation(ops, 0, 0) == []
 
+
 def test_copy_only():
-    costs, ops = compute_transform_tables("abc", "abc", 1,2,3,3)
+    costs, ops = compute_transform_tables("abc", "abc", 1, 2, 3, 3)
     assert costs[-1][-1] == 3  # cost = sum of copy costs
-    assert assemble_transformation(ops, len(ops)-1, len(ops[0])-1) == ["Ca", "Cb", "Cc"]
+    assert assemble_transformation(ops, len(ops) - 1, len(ops[0]) - 1) == [
+        "Ca",
+        "Cb",
+        "Cc",
+    ]
+
 
 def test_insert_only():
-    costs, ops = compute_transform_tables("", "xyz", 1,1,1,1)
-    seq = assemble_transformation(ops, 0, len(ops[0])-1)
+    costs, ops = compute_transform_tables("", "xyz", 1, 1, 1, 1)
+    seq = assemble_transformation(ops, 0, len(ops[0]) - 1)
     assert seq == ["Ix", "Iy", "Iz"]