diff --git a/.gitignore b/.gitignore
index 2b16aebb..73192407 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,7 +7,7 @@
 settings_local.py
 .build
 build
-.*.sw[po]
+.*.sw[pon]
 dist/
 *.egg-info
 doc/__build/*
diff --git a/kombu/tests/test_transport_mongodb.py b/kombu/tests/test_transport_mongodb.py
index 8d041094..268867da 100644
--- a/kombu/tests/test_transport_mongodb.py
+++ b/kombu/tests/test_transport_mongodb.py
@@ -1,12 +1,8 @@
 from __future__ import absolute_import
 
-import sys
-
 from kombu.connection import BrokerConnection
 
-from .utils import TestCase
-from .utils import mask_modules, Mock
-from .utils import Mock, skip_if_not_module
+from .utils import TestCase, skip_if_not_module
 
 
 class MockConnection(dict):
diff --git a/kombu/tests/test_transport_redis.py b/kombu/tests/test_transport_redis.py
index 86576dd0..0d86b5e2 100644
--- a/kombu/tests/test_transport_redis.py
+++ b/kombu/tests/test_transport_redis.py
@@ -442,7 +442,6 @@ class test_Channel(TestCase):
         self.assertListEqual(channel.get_table('celery'),
                              [('celery', '', 'celery')])
 
-
         # ... then for some reason, the _kombu.binding.celery key gets lost
         channel.client.srem(key)
 
diff --git a/kombu/transport/mongodb.py b/kombu/transport/mongodb.py
index 71d33916..6ab80ad0 100644
--- a/kombu/transport/mongodb.py
+++ b/kombu/transport/mongodb.py
@@ -121,7 +121,9 @@ class Channel(virtual.Channel):
 
         # At this point we expect the hostname to be something like
         # (considering replica set form too):
-        # mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[?options]]
+        #
+        #   mongodb://[username:password@]host1[:port1][,host2[:port2],
+        #   ...[,hostN[:portN]]][/[?options]]
         mongoconn = Connection(host=hostname)
         version = mongoconn.server_info()["version"]
         if tuple(map(int, version.split(".")[:2])) < (1, 3):