--- tests/topotests/lib/topotest.py-orig	2019-12-10 23:17:14.241938136 -0300
+++ tests/topotests/lib/topotest.py	2019-12-10 23:17:27.978005193 -0300
@@ -29,7 +29,10 @@
 import sys
 import functools
 import glob
-import StringIO
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
 import subprocess
 import tempfile
 import platform
--- tests/topotests/lib/common_config.py-orig	2019-12-10 23:17:59.526550785 -0300
+++ tests/topotests/lib/common_config.py	2019-12-10 23:18:23.139134928 -0300
@@ -28,7 +28,11 @@
 from functools import wraps
 from re import search as re_search
 
-import StringIO
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
+
 import os
 import ConfigParser
 import traceback