diff --git a/tangostationcontrol/tangostationcontrol/devices/antennafield.py b/tangostationcontrol/tangostationcontrol/devices/antennafield.py
index 6479abf92dcb35c3bd0092eb57740da4514b5453..e3289b9b7df79719cfdf56e3508a66bcaeb869db 100644
--- a/tangostationcontrol/tangostationcontrol/devices/antennafield.py
+++ b/tangostationcontrol/tangostationcontrol/devices/antennafield.py
@@ -16,7 +16,6 @@ from tango import DeviceProxy, DevSource, AttrWriteType, DevVarFloatArray, DevVa
 from tango.server import device_property, attribute, command
 
 # Additional import
-from tangostationcontrol.common.type_checking import sequence_not_str
 from tangostationcontrol.common.type_checking import type_not_sequence
 from tangostationcontrol.common.entrypoint import entry
 from tangostationcontrol.devices.lofar_device import lofar_device
diff --git a/tangostationcontrol/tangostationcontrol/test/common/test_type_checking.py b/tangostationcontrol/tangostationcontrol/test/common/test_type_checking.py
index 051001fc8a7e7f4e7f9050ec40365c2afe8e15de..253fb6182006a426188e84576bf295344f973549 100644
--- a/tangostationcontrol/tangostationcontrol/test/common/test_type_checking.py
+++ b/tangostationcontrol/tangostationcontrol/test/common/test_type_checking.py
@@ -35,8 +35,8 @@ class TestTypeChecking(base.TestCase):
         """Test object is sequence based on properties and verify is_sequence"""
 
         result = (
-            self.subscriptable(obj) & self.iterable(obj) &
-            self.positional_ordering(obj)
+            self.subscriptable(obj) & self.iterable(obj)
+            & self.positional_ordering(obj)
         )
 
         self.assertEqual(
@@ -73,5 +73,5 @@ class TestTypeChecking(base.TestCase):
 
     def test_type_not_sequence(self):
         test = [str]
-        self.asserFalse(type_checking.type_not_sequence(test))
-        self.asserTrue(type_checking.type_not_sequence(test[0]))
+        self.assertFalse(type_checking.type_not_sequence(test))
+        self.assertTrue(type_checking.type_not_sequence(test[0]))
diff --git a/tangostationcontrol/tangostationcontrol/test/devices/test_antennafield_device.py b/tangostationcontrol/tangostationcontrol/test/devices/test_antennafield_device.py
index 465db52aa16855a727ff06467c1f25e9965dfd0d..23e08c71bb07db68319b8795d90cfcacc0846810 100644
--- a/tangostationcontrol/tangostationcontrol/test/devices/test_antennafield_device.py
+++ b/tangostationcontrol/tangostationcontrol/test/devices/test_antennafield_device.py
@@ -7,8 +7,6 @@
 # Distributed under the terms of the APACHE license.
 # See LICENSE.txt for more info.
 
-import time
-import statistics
 import logging
 
 import unittest