diff --git a/niworkflows/interfaces/bids.py b/niworkflows/interfaces/bids.py
index ec7131dff3a..3eefaa76c2e 100644
--- a/niworkflows/interfaces/bids.py
+++ b/niworkflows/interfaces/bids.py
@@ -216,9 +216,7 @@ def _run_interface(self, runtime):
             except ValueError:
                 pass
         params = parse_file_entities(in_file)
-        self._results = {
-            key: params.get(key, Undefined) for key in _BIDSInfoOutputSpec().get().keys()
-        }
+        self._results = {key: params.get(key, Undefined) for key in _BIDSInfoOutputSpec().get()}
         return runtime
 
 
diff --git a/niworkflows/interfaces/surf.py b/niworkflows/interfaces/surf.py
index 2a1fd76da21..ed01426f1bb 100644
--- a/niworkflows/interfaces/surf.py
+++ b/niworkflows/interfaces/surf.py
@@ -182,7 +182,7 @@ def _outputs(self):
             trait_change_notify=False,
             **{
                 entity: Undefined
-                for entity in self._pattern.groupindex.keys()
+                for entity in self._pattern.groupindex
                 if entity not in self._excluded
             },
         )
diff --git a/niworkflows/reports/core.py b/niworkflows/reports/core.py
index d954fa34c97..353d77cb9ca 100644
--- a/niworkflows/reports/core.py
+++ b/niworkflows/reports/core.py
@@ -463,8 +463,7 @@ def _process_orderings(orderings, layout):
         ]
         # if all values are None for an entity, we do not want to keep that entity
         keep_idx = [
-            False if (len(val_set) == 1 and None in val_set) or not val_set else True
-            for val_set in unique_values
+            not (len(val_set) == 1 and None in val_set or not val_set) for val_set in unique_values
         ]
         # the "kept" entities
         entities = list(compress(orderings, keep_idx))
diff --git a/niworkflows/utils/spaces.py b/niworkflows/utils/spaces.py
index eb82851bd7c..e44dab9b26f 100644
--- a/niworkflows/utils/spaces.py
+++ b/niworkflows/utils/spaces.py
@@ -521,10 +521,7 @@ def __contains__(self, item):
         if not self.references:
             return False
         item = self.check_space(item)
-        for s in self.references:
-            if s == item:
-                return True
-        return False
+        return any(s == item for s in self.references)
 
     def __str__(self):
         """
@@ -730,10 +727,7 @@ def __call__(self, parser, namespace, values, option_string=None):
 
 def hasspec(value, specs):
     """Check whether any of the keys are in a dict."""
-    for s in specs:
-        if s in value:
-            return True
-    return False
+    return any(s in value for s in specs)
 
 
 def format_reference(in_tuple):
diff --git a/niworkflows/utils/timeseries.py b/niworkflows/utils/timeseries.py
index d66b11cd726..3ac00b22350 100644
--- a/niworkflows/utils/timeseries.py
+++ b/niworkflows/utils/timeseries.py
@@ -42,7 +42,7 @@ def _cifti_timeseries(dataset):
     }
     seg = {label: [] for label in list(labels.values()) + ['Other']}
     for bm in matrix.get_index_map(1).brain_models:
-        label = 'Other' if bm.brain_structure not in labels else labels[bm.brain_structure]
+        label = labels.get(bm.brain_structure, 'Other')
         seg[label] += list(range(bm.index_offset, bm.index_offset + bm.index_count))
 
     return dataset.get_fdata(dtype='float32').T, seg