diff --git a/python/gtsam/tests/test_HybridFactorGraph.py b/python/gtsam/tests/test_HybridFactorGraph.py
index 576efa82f..37bb5b93c 100644
--- a/python/gtsam/tests/test_HybridFactorGraph.py
+++ b/python/gtsam/tests/test_HybridFactorGraph.py
@@ -10,21 +10,19 @@ Author: Fan Jiang
 """
 # pylint: disable=invalid-name, no-name-in-module, no-member
 
-from __future__ import print_function
-
 import unittest
 
-import gtsam
 import numpy as np
 from gtsam.symbol_shorthand import C, X
 from gtsam.utils.test_case import GtsamTestCase
 
+import gtsam
+
 
 class TestHybridGaussianFactorGraph(GtsamTestCase):
     """Unit tests for HybridGaussianFactorGraph."""
-
     def test_create(self):
-        """Test contruction of hybrid factor graph."""
+        """Test construction of hybrid factor graph."""
         noiseModel = gtsam.noiseModel.Unit.Create(3)
         dk = gtsam.DiscreteKeys()
         dk.push_back((C(0), 2))
@@ -45,7 +43,6 @@ class TestHybridGaussianFactorGraph(GtsamTestCase):
             gtsam.Ordering.ColamdConstrainedLastHybridGaussianFactorGraph(
                 hfg, [C(0)]))
 
-        # print("hbn = ", hbn)
         self.assertEqual(hbn.size(), 2)
 
         mixture = hbn.at(0).inner()
@@ -56,7 +53,7 @@ class TestHybridGaussianFactorGraph(GtsamTestCase):
         self.assertIsInstance(discrete_conditional, gtsam.DiscreteConditional)
 
     def test_optimize(self):
-        """Test contruction of hybrid factor graph."""
+        """Test construction of hybrid factor graph."""
         noiseModel = gtsam.noiseModel.Unit.Create(3)
         dk = gtsam.DiscreteKeys()
         dk.push_back((C(0), 2))
@@ -73,16 +70,16 @@ class TestHybridGaussianFactorGraph(GtsamTestCase):
         hfg.add(jf2)
         hfg.push_back(gmf)
 
-        dtf = gtsam.DecisionTreeFactor([(C(0), 2)],"0 1")
+        dtf = gtsam.DecisionTreeFactor([(C(0), 2)], "0 1")
         hfg.add(dtf)
 
         hbn = hfg.eliminateSequential(
             gtsam.Ordering.ColamdConstrainedLastHybridGaussianFactorGraph(
                 hfg, [C(0)]))
 
-        # print("hbn = ", hbn)
         hv = hbn.optimize()
         self.assertEqual(hv.atDiscrete(C(0)), 1)
 
+
 if __name__ == "__main__":
     unittest.main()