diff --git a/sksurgeryeval/algorithms/locators.py b/sksurgeryeval/algorithms/locators.py
index c50c5cd..a89a6e4 100644
--- a/sksurgeryeval/algorithms/locators.py
+++ b/sksurgeryeval/algorithms/locators.py
@@ -58,7 +58,7 @@ def is_hit(self, tracking, logger):
                                  str(self._targets[self._target_index])])
 
             if index == self._targets[self._target_index]:
-                logger.log(message="Hit target:{0}".format(index))
+                logger.log(message=f"Hit target:{index}")
                 self._set_target_inactive(self._targets[self._target_index])
                 self._target_index = self._target_index + 1
                 if self._target_index < len(self._locators):
diff --git a/sksurgeryeval/shapes/cone.py b/sksurgeryeval/shapes/cone.py
index 0620c3b..2d2224f 100644
--- a/sksurgeryeval/shapes/cone.py
+++ b/sksurgeryeval/shapes/cone.py
@@ -25,8 +25,7 @@ def __init__(self, height, radius, colour, name, visibility=True,
         :param opacity: float [0,1]
         """
 
-        super(VTKConeModel, self).__init__(None, colour, visibility,
-                                           opacity)
+        super().__init__(None, colour, visibility, opacity)
         self.name = name
 
         cone = vtk.vtkConeSource()