diff --git a/src/spikeinterface/core/analyzer_extension_core.py b/src/spikeinterface/core/analyzer_extension_core.py
index a7c01afab6..81eb86a8c4 100644
--- a/src/spikeinterface/core/analyzer_extension_core.py
+++ b/src/spikeinterface/core/analyzer_extension_core.py
@@ -434,9 +434,9 @@ def _select_extension_data(self, unit_ids):
             new_data[key] = arr[keep_unit_indices, :, :]
 
         return new_data
-    
+
     def _merge_extension_data(self, merges, former_unit_ids):
-        
+
         new_unit_ids = self.sorting_analyzer._get_ids_after_merging(merges)
         new_data = dict()
         for key, arr in self.data.items():
@@ -608,7 +608,7 @@ def _set_params(self, num_chunks_per_segment=20, chunk_size=10000, seed=None):
     def _select_extension_data(self, unit_ids):
         # this do not depend on units
         return self.data
-    
+
     def _merge_extension_data(self, merges):
         # this do not depend on units
         return self.data
diff --git a/src/spikeinterface/core/sorting_tools.py b/src/spikeinterface/core/sorting_tools.py
index e76a018318..d1629a6f57 100644
--- a/src/spikeinterface/core/sorting_tools.py
+++ b/src/spikeinterface/core/sorting_tools.py
@@ -210,6 +210,7 @@ def random_spikes_selection(
 
     return random_spikes_indices
 
+
 def apply_merges_to_sorting(sorting, merges, censor_ms=None):
     """
     Function to apply a resolved representation of the merges to a sorting object. If censor_ms is not None,
@@ -245,6 +246,7 @@ def apply_merges_to_sorting(sorting, merges, censor_ms=None):
                 )
 
     from spikeinterface.core import NumpySorting
+
     times_list = []
     labels_list = []
     for segment_index in range(sorting.get_num_segments()):
@@ -259,4 +261,4 @@ def apply_merges_to_sorting(sorting, merges, censor_ms=None):
             labels_list += [sorting.unit_ids[labels]]
 
     sorting = NumpySorting.from_times_labels(times_list, labels_list, sorting.sampling_frequency)
-    return sorting
\ No newline at end of file
+    return sorting
diff --git a/src/spikeinterface/core/sortinganalyzer.py b/src/spikeinterface/core/sortinganalyzer.py
index 51745dfe47..78f69f8919 100644
--- a/src/spikeinterface/core/sortinganalyzer.py
+++ b/src/spikeinterface/core/sortinganalyzer.py
@@ -613,7 +613,9 @@ def _get_ids_after_merging(self, merges):
                 new_unit_ids.discard(id)
         return list(new_unit_ids)
 
-    def _save_or_select_or_merge(self, format="binary_folder", folder=None, unit_ids=None, merges=None) -> "SortingAnalyzer":
+    def _save_or_select_or_merge(
+        self, format="binary_folder", folder=None, unit_ids=None, merges=None
+    ) -> "SortingAnalyzer":
         """
         Internal used by both save_as(), copy() and select_units() which are more or less the same.
         """
@@ -655,6 +657,7 @@ def _save_or_select_or_merge(self, format="binary_folder", folder=None, unit_ids
             sorting_provenance = sorting_provenance.select_units(unit_ids)
         elif merges is not None:
             from spikeinterface.core.sorting_tools import apply_merges_to_sorting
+
             sorting_provenance = apply_merges_to_sorting(sorting_provenance, merges)
 
         if format == "memory":
diff --git a/src/spikeinterface/postprocessing/amplitude_scalings.py b/src/spikeinterface/postprocessing/amplitude_scalings.py
index 615d434dfa..d6be0d4028 100644
--- a/src/spikeinterface/postprocessing/amplitude_scalings.py
+++ b/src/spikeinterface/postprocessing/amplitude_scalings.py
@@ -113,7 +113,7 @@ def _select_extension_data(self, unit_ids):
         if self.params["handle_collisions"]:
             new_data["collision_mask"] = self.data["collision_mask"][keep_spike_mask]
         return new_data
-    
+
     def _merge_extension_data(self, merges):
         # keep_unit_indices = np.flatnonzero(np.isin(self.sorting_analyzer.unit_ids, unit_ids))