diff --git a/pyoptsparse/pyOpt_optimization.py b/pyoptsparse/pyOpt_optimization.py
index 6abecd03..68f2ecd4 100644
--- a/pyoptsparse/pyOpt_optimization.py
+++ b/pyoptsparse/pyOpt_optimization.py
@@ -697,10 +697,7 @@ def printSparsity(self, verticalPrint=False):
                         var_str = "(" + str(self.dvOffset[dvGroup][1] - self.dvOffset[dvGroup][0]) + ")"
                         half_length = len(var_str) / 2
                         k = int(varCenters[j])
-                        txt[
-                            i,
-                            int(k - half_length + 1) : int(k - half_length + 1 + len(var_str)),
-                        ] = list(var_str)
+                        txt[i, int(k - half_length + 1) : int(k - half_length + 1 + len(var_str))] = list(var_str)
 
         for i in range(len(txt)):
             print("".join(txt[i]))