STY: Apply ruff rule RUF017

RUF017 Avoid quadratic list summation

Author: DimitriPapadopoulos

nipype/info.py

@@ -187,7 +187,7 @@ def get_nipype_gitversion():
 
 
 def _list_union(iterable):
-    return list(set(sum(iterable, [])))
+    return list(set(x for sublist in iterable for x in sublist))
 
 
 # Enable a handle to install all extra dependencies at once

nipype/interfaces/fsl/utils.py

@@ -483,7 +483,9 @@ class ExtractROI(FSLCommand):
 
     def _format_arg(self, name, spec, value):
         if name == "crop_list":
-            return " ".join(map(str, sum(list(map(list, value)), [])))
+            return " ".join(
+                map(str, (x for sublist in map(list, value) for x in sublist))
+            )
         return super()._format_arg(name, spec, value)
 
     def _list_outputs(self):