diff --git a/python/pyspark/mllib/tests.py b/python/pyspark/mllib/tests.py
index 24843d3c4eaf2..a427f7c820200 100644
--- a/python/pyspark/mllib/tests.py
+++ b/python/pyspark/mllib/tests.py
@@ -136,7 +136,7 @@ def test_classification(self):
         self.assertTrue(nb_model.predict(features[2]) <= 0)
         self.assertTrue(nb_model.predict(features[3]) > 0)
 
-        categoricalFeaturesInfo = {0: 3} # feature 0 has 3 categories
+        categoricalFeaturesInfo = {0: 3}  # feature 0 has 3 categories
         dt_model = \
             DecisionTree.trainClassifier(rdd, numClasses=2,
                                          categoricalFeaturesInfo=categoricalFeaturesInfo)
@@ -176,9 +176,10 @@ def test_regression(self):
         self.assertTrue(rr_model.predict(features[2]) <= 0)
         self.assertTrue(rr_model.predict(features[3]) > 0)
 
-        categoricalFeaturesInfo = {0: 2} # feature 0 has 2 categories
+        categoricalFeaturesInfo = {0: 2}  # feature 0 has 2 categories
         dt_model = \
-            DecisionTree.trainRegressor(rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
+            DecisionTree.trainRegressor(
+                rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
         self.assertTrue(dt_model.predict(features[0]) <= 0)
         self.assertTrue(dt_model.predict(features[1]) > 0)
         self.assertTrue(dt_model.predict(features[2]) <= 0)
@@ -290,7 +291,7 @@ def test_classification(self):
         self.assertTrue(nb_model.predict(features[2]) <= 0)
         self.assertTrue(nb_model.predict(features[3]) > 0)
 
-        categoricalFeaturesInfo = {0: 3} # feature 0 has 3 categories
+        categoricalFeaturesInfo = {0: 3}  # feature 0 has 3 categories
         dt_model = DecisionTree.trainClassifier(rdd, numClasses=2,
                                                 categoricalFeaturesInfo=categoricalFeaturesInfo)
         self.assertTrue(dt_model.predict(features[0]) <= 0)
@@ -329,8 +330,9 @@ def test_regression(self):
         self.assertTrue(rr_model.predict(features[2]) <= 0)
         self.assertTrue(rr_model.predict(features[3]) > 0)
 
-        categoricalFeaturesInfo = {0: 2} # feature 0 has 2 categories
-        dt_model = DecisionTree.trainRegressor(rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
+        categoricalFeaturesInfo = {0: 2}  # feature 0 has 2 categories
+        dt_model = DecisionTree.trainRegressor(
+            rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
         self.assertTrue(dt_model.predict(features[0]) <= 0)
         self.assertTrue(dt_model.predict(features[1]) > 0)
         self.assertTrue(dt_model.predict(features[2]) <= 0)
diff --git a/python/pyspark/mllib/tree.py b/python/pyspark/mllib/tree.py
index 1e0006df75ac6..5713fa7be0297 100644
--- a/python/pyspark/mllib/tree.py
+++ b/python/pyspark/mllib/tree.py
@@ -25,7 +25,9 @@
 from pyspark.mllib.regression import LabeledPoint
 from pyspark.serializers import NoOpSerializer
 
+
 class DecisionTreeModel(object):
+
     """
     A decision tree model for classification or regression.
 
@@ -77,6 +79,7 @@ def __str__(self):
 
 
 class DecisionTree(object):
+
     """
     Learning algorithm for a decision tree model
     for classification or regression.
@@ -174,7 +177,6 @@ def trainRegressor(data, categoricalFeaturesInfo={},
                                   categoricalFeaturesInfo,
                                   impurity, maxDepth, maxBins)
 
-
     @staticmethod
     def train(data, algo, numClasses, categoricalFeaturesInfo,
               impurity, maxDepth, maxBins=100):
@@ -216,7 +218,8 @@ def _test():
     import doctest
     globs = globals().copy()
     globs['sc'] = SparkContext('local[4]', 'PythonTest', batchSize=2)
-    (failure_count, test_count) = doctest.testmod(globs=globs, optionflags=doctest.ELLIPSIS)
+    (failure_count, test_count) = doctest.testmod(
+        globs=globs, optionflags=doctest.ELLIPSIS)
     globs['sc'].stop()
     if failure_count:
         exit(-1)
diff --git a/python/pyspark/mllib/util.py b/python/pyspark/mllib/util.py
index 9ecceaead346f..75754286cd622 100644
--- a/python/pyspark/mllib/util.py
+++ b/python/pyspark/mllib/util.py
@@ -127,7 +127,8 @@ def loadLibSVMFile(sc, path, numFeatures=-1, minPartitions=None):
         parsed = lines.map(lambda l: MLUtils._parse_libsvm_line(l))
         if numFeatures <= 0:
             parsed.cache()
-            numFeatures = parsed.map(lambda x: -1 if x[1].size == 0 else x[1][-1]).reduce(max) + 1
+            numFeatures = parsed.map(
+                lambda x: -1 if x[1].size == 0 else x[1][-1]).reduce(max) + 1
         return parsed.map(lambda x: LabeledPoint(x[0], Vectors.sparse(numFeatures, x[1], x[2])))
 
     @staticmethod
diff --git a/python/pyspark/sql.py b/python/pyspark/sql.py
index cabd4fa71222d..6fbdfb171b921 100644
--- a/python/pyspark/sql.py
+++ b/python/pyspark/sql.py
@@ -981,9 +981,10 @@ def registerFunction(self, name, f, returnType=StringType()):
         env = MapConverter().convert(self._sc.environment,
                                      self._sc._gateway._gateway_client)
         includes = ListConverter().convert(self._sc._python_includes,
-                                     self._sc._gateway._gateway_client)
+                                           self._sc._gateway._gateway_client)
         self._ssql_ctx.registerPython(name,
-                                      bytearray(CloudPickleSerializer().dumps(command)),
+                                      bytearray(
+                                          CloudPickleSerializer().dumps(command)),
                                       env,
                                       includes,
                                       self._sc.pythonExec,
@@ -1525,7 +1526,8 @@ def registerTempTable(self, name):
         self._jschema_rdd.registerTempTable(name)
 
     def registerAsTable(self, name):
-        warnings.warn("Use registerTempTable instead of registerAsTable.", DeprecationWarning)
+        warnings.warn(
+            "Use registerTempTable instead of registerAsTable.", DeprecationWarning)
         self.registerTempTable(name)
 
     def insertInto(self, tableName, overwrite=False):