diff --git a/monitoring/google/cloud/monitoring_v3/__init__.py b/monitoring/google/cloud/monitoring_v3/__init__.py
index 00cdaaf7aed6..946324414d44 100644
--- a/monitoring/google/cloud/monitoring_v3/__init__.py
+++ b/monitoring/google/cloud/monitoring_v3/__init__.py
@@ -19,7 +19,8 @@
 from google.cloud.monitoring_v3.gapic import enums
 from google.cloud.monitoring_v3.gapic import group_service_client
 from google.cloud.monitoring_v3.gapic import metric_service_client
-from google.cloud.monitoring_v3.gapic import notification_channel_service_client
+from google.cloud.monitoring_v3.gapic import \
+    notification_channel_service_client
 from google.cloud.monitoring_v3.gapic import uptime_check_service_client
 
 
@@ -41,7 +42,8 @@ class MetricServiceClient(metric_service_client.MetricServiceClient):
 
 class NotificationChannelServiceClient(
         notification_channel_service_client.NotificationChannelServiceClient):
-    __doc__ = notification_channel_service_client.NotificationChannelServiceClient.__doc__
+    __doc__ = notification_channel_service_client.\
+        NotificationChannelServiceClient.__doc__
     enums = enums
 
 
diff --git a/monitoring/google/cloud/monitoring_v3/_dataframe.py b/monitoring/google/cloud/monitoring_v3/_dataframe.py
index f2624853c21e..24708249e562 100644
--- a/monitoring/google/cloud/monitoring_v3/_dataframe.py
+++ b/monitoring/google/cloud/monitoring_v3/_dataframe.py
@@ -17,7 +17,7 @@
 import itertools
 try:
     import pandas
-except ImportError:
+except ImportError:  # pragma: NO COVER
     pandas = None
 
 from google.cloud.monitoring_v3.types import TimeSeries
diff --git a/monitoring/google/cloud/monitoring_v3/proto/common_pb2.py b/monitoring/google/cloud/monitoring_v3/proto/common_pb2.py
index c1dfba6392c7..40805bc689b2 100644
--- a/monitoring/google/cloud/monitoring_v3/proto/common_pb2.py
+++ b/monitoring/google/cloud/monitoring_v3/proto/common_pb2.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/cloud/monitoring_v3/proto/common.proto
 
diff --git a/monitoring/tests/unit/test__dataframe.py b/monitoring/tests/unit/test__dataframe.py
index 553a3a6afc8e..e4efb46adce7 100644
--- a/monitoring/tests/unit/test__dataframe.py
+++ b/monitoring/tests/unit/test__dataframe.py
@@ -104,7 +104,9 @@ def test_simple_label(self):
         self.assertEqual(dataframe.shape, DIMENSIONS)
         self.assertEqual(dataframe.values.tolist(), ARRAY)
 
-        self.assertEqual(list(dataframe.columns), INSTANCE_NAMES)
+        expected_headers = [(instance_name,)
+                            for instance_name in INSTANCE_NAMES]
+        self.assertEqual(list(dataframe.columns), expected_headers)
         self.assertIsNone(dataframe.columns.name)
 
         self.assertEqual(list(dataframe.index), parse_timestamps())
@@ -138,9 +140,10 @@ def test_multiple_labels_with_just_one(self):
         self.assertEqual(dataframe.shape, DIMENSIONS)
         self.assertEqual(dataframe.values.tolist(), ARRAY)
 
-        self.assertEqual(list(dataframe.columns), INSTANCE_IDS)
+        expected_headers = [(instance_id,) for instance_id in INSTANCE_IDS]
+        self.assertEqual(list(dataframe.columns), expected_headers)
         self.assertEqual(dataframe.columns.names, NAMES)
-        self.assertEqual(dataframe.columns.name, NAME)
+        self.assertIsNone(dataframe.columns.name)
 
         self.assertEqual(list(dataframe.index), parse_timestamps())
         self.assertIsNone(dataframe.index.name)
@@ -189,7 +192,7 @@ def test_empty_table_multiple_labels_with_just_one(self):
         dataframe = self._call_fut([], labels=NAMES)
         self.assertEqual(dataframe.shape, (0, 0))
         self.assertEqual(dataframe.columns.names, NAMES)
-        self.assertEqual(dataframe.columns.name, NAME)
+        self.assertIsNone(dataframe.columns.name)
         self.assertIsNone(dataframe.index.name)
         self.assertIsInstance(dataframe.index, pandas.DatetimeIndex)
 
@@ -199,7 +202,7 @@ def test_empty_table_smart_labels(self):
         dataframe = self._call_fut([])
         self.assertEqual(dataframe.shape, (0, 0))
         self.assertEqual(dataframe.columns.names, NAMES)
-        self.assertEqual(dataframe.columns.name, NAME)
+        self.assertIsNone(dataframe.columns.name)
         self.assertIsNone(dataframe.index.name)
         self.assertIsInstance(dataframe.index, pandas.DatetimeIndex)
 
diff --git a/monitoring/tests/unit/test_query.py b/monitoring/tests/unit/test_query.py
index 224adae9e416..6feb24d5db5e 100644
--- a/monitoring/tests/unit/test_query.py
+++ b/monitoring/tests/unit/test_query.py
@@ -14,7 +14,6 @@
 
 from __future__ import absolute_import
 
-import copy
 import datetime
 import unittest
 import mock
@@ -297,7 +296,6 @@ def test_request_parameters_maximal(self):
         FIELD1, FIELD2 = 'resource.zone', 'metric.instance_name'
 
         PAGE_SIZE = 100
-        PAGE_TOKEN = 'second-page-please'
 
         channel = ChannelStub()
         client = MetricServiceClient(channel=channel)