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

Author: pre-commit-ci[bot]

src/diffpy/srmise/modelcluster.py

@@ -1539,7 +1539,7 @@ def prune(self):
                     lo = max(i - peak_range, 0)
                     hi = min(i + peak_range + 1, len(best_model))
                     check_models[i] = type(best_model)(best_model[lo:i]).copy()
-                    check_models[i].extend(type(best_model)(best_model[i + 1: hi]).copy())
+                    check_models[i].extend(type(best_model)(best_model[i + 1 : hi]).copy())
                     prune_mc.model = check_models[i]
 
                     msg = [