diff --git a/virttest/asset.py b/virttest/asset.py
index d40af7352b..e5ab0369fe 100644
--- a/virttest/asset.py
+++ b/virttest/asset.py
@@ -5,9 +5,10 @@
 import re
 import shutil
 
+from avocado.utils import astring, crypto, download, genio, git, process
+
 from six import StringIO
 
-from avocado.utils import astring, crypto, download, genio, git, process
 from six import string_types
 from six.moves import urllib
 
diff --git a/virttest/utils_config.py b/virttest/utils_config.py
index a476c13da4..1d25fb48cd 100644
--- a/virttest/utils_config.py
+++ b/virttest/utils_config.py
@@ -3,10 +3,10 @@
 import logging
 import os.path
 
-from six import StringIO
-
 from avocado.utils import distro
 
+from six import StringIO
+
 LOG = logging.getLogger("avocado." + __name__)
 
 
diff --git a/virttest/utils_disk.py b/virttest/utils_disk.py
index 510b793918..d0176c57be 100644
--- a/virttest/utils_disk.py
+++ b/virttest/utils_disk.py
@@ -15,12 +15,12 @@
 import string
 import tempfile
 
-from functools import cmp_to_key
-
 from avocado.core import exceptions
 from avocado.utils import process, wait
 from avocado.utils.service import SpecificServiceManager
 
+from functools import cmp_to_key
+
 from virttest import error_context, remote, utils_misc, utils_numeric
 
 PARTITION_TABLE_TYPE_MBR = "msdos"