diff --git a/diskimage_builder/block_device/__init__.py b/diskimage_builder/block_device/__init__.py
index 543ad005..0d5bb352 100644
--- a/diskimage_builder/block_device/__init__.py
+++ b/diskimage_builder/block_device/__init__.py
@@ -13,9 +13,10 @@
 # under the License.
 
 import argparse
+import logging
+
 from diskimage_builder.block_device.blockdevice import BlockDevice
 from diskimage_builder import logging_config
-import logging
 
 
 def generate_phase_doc():
diff --git a/diskimage_builder/block_device/blockdevice.py b/diskimage_builder/block_device/blockdevice.py
index 9f2958eb..769b9fa2 100644
--- a/diskimage_builder/block_device/blockdevice.py
+++ b/diskimage_builder/block_device/blockdevice.py
@@ -13,17 +13,19 @@
 # under the License.
 
 import codecs
-from diskimage_builder.block_device.blockdevicesetupexception \
-    import BlockDeviceSetupException
-from diskimage_builder.graph.digraph import Digraph
 import json
 import logging
 import os
 import shutil
-from stevedore import extension
 import sys
 import yaml
 
+from stevedore import extension
+
+from diskimage_builder.block_device.blockdevicesetupexception \
+    import BlockDeviceSetupException
+from diskimage_builder.graph.digraph import Digraph
+
 
 logger = logging.getLogger(__name__)
 
diff --git a/diskimage_builder/block_device/level0/localloop.py b/diskimage_builder/block_device/level0/localloop.py
index f54fa95c..78cf5559 100644
--- a/diskimage_builder/block_device/level0/localloop.py
+++ b/diskimage_builder/block_device/level0/localloop.py
@@ -12,15 +12,16 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import logging
+import os
+import subprocess
+
 from diskimage_builder.block_device.blockdevicesetupexception \
     import BlockDeviceSetupException
 from diskimage_builder.block_device.plugin_base import NodePluginBase
 from diskimage_builder.block_device.tree_config import TreeConfig
 from diskimage_builder.block_device.utils import parse_abs_size_spec
 from diskimage_builder.graph.digraph import Digraph
-import logging
-import os
-import subprocess
 
 
 logger = logging.getLogger(__name__)
diff --git a/diskimage_builder/block_device/level1/mbr.py b/diskimage_builder/block_device/level1/mbr.py
index 65b108b3..69cff736 100644
--- a/diskimage_builder/block_device/level1/mbr.py
+++ b/diskimage_builder/block_device/level1/mbr.py
@@ -13,6 +13,8 @@
 # under the License.
 import logging
 import random
+
+
 from struct import pack
 
 
diff --git a/diskimage_builder/block_device/level1/partitioning.py b/diskimage_builder/block_device/level1/partitioning.py
index 98286e24..72dc9e47 100644
--- a/diskimage_builder/block_device/level1/partitioning.py
+++ b/diskimage_builder/block_device/level1/partitioning.py
@@ -12,6 +12,11 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import logging
+import os
+
+from subprocess import CalledProcessError
+
 from diskimage_builder.block_device.blockdevicesetupexception \
     import BlockDeviceSetupException
 from diskimage_builder.block_device.level1.mbr import MBR
@@ -21,9 +26,7 @@ from diskimage_builder.block_device.utils import exec_sudo
 from diskimage_builder.block_device.utils import parse_abs_size_spec
 from diskimage_builder.block_device.utils import parse_rel_size_spec
 from diskimage_builder.graph.digraph import Digraph
-import logging
-import os
-from subprocess import CalledProcessError
+
 
 logger = logging.getLogger(__name__)
 
diff --git a/diskimage_builder/block_device/plugin_base.py b/diskimage_builder/block_device/plugin_base.py
index c92ff77c..29cbdc17 100644
--- a/diskimage_builder/block_device/plugin_base.py
+++ b/diskimage_builder/block_device/plugin_base.py
@@ -13,9 +13,10 @@
 # under the License.
 
 import abc
-from diskimage_builder.graph.digraph import Digraph
 import six
 
+from diskimage_builder.graph.digraph import Digraph
+
 
 @six.add_metaclass(abc.ABCMeta)
 class PluginBase(object):
diff --git a/diskimage_builder/block_device/tests/test_utils.py b/diskimage_builder/block_device/tests/test_utils.py
index 570c7265..9e98586a 100644
--- a/diskimage_builder/block_device/tests/test_utils.py
+++ b/diskimage_builder/block_device/tests/test_utils.py
@@ -12,9 +12,10 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from diskimage_builder.block_device.utils import parse_abs_size_spec
 import testtools
 
+from diskimage_builder.block_device.utils import parse_abs_size_spec
+
 
 class TestLoggingConfig(testtools.TestCase):