diff --git a/test/py/tests/test_efi_secboot/conftest.py b/test/py/tests/test_efi_secboot/conftest.py
index f74b4b109a7b..34abcd79ae00 100644
--- a/test/py/tests/test_efi_secboot/conftest.py
+++ b/test/py/tests/test_efi_secboot/conftest.py
@@ -4,9 +4,8 @@
 
 import os
 import os.path
-import pytest
-import re
 from subprocess import call, check_call, check_output, CalledProcessError
+import pytest
 from defs import *
 
 # from test/py/conftest.py
@@ -14,8 +13,8 @@ from defs import *
 
 def tool_is_in_path(tool):
     for path in os.environ["PATH"].split(os.pathsep):
-        fn = os.path.join(path, tool)
-        if os.path.isfile(fn) and os.access(fn, os.X_OK):
+        full_path = os.path.join(path, tool)
+        if os.path.isfile(full_path) and os.access(full_path, os.X_OK):
             return True
     return False
 
@@ -164,8 +163,8 @@ def efi_boot_env(request, u_boot_config):
         check_call('sudo umount %s' % loop_dev, shell=True)
         check_call('sudo losetup -d %s' % loop_dev, shell=True)
 
-    except CalledProcessError as e:
-        pytest.skip('Setup failed: %s' % e.cmd)
+    except CalledProcessError as exception:
+        pytest.skip('Setup failed: %s' % exception.cmd)
         return
     else:
         yield image_path
diff --git a/test/py/tests/test_efi_secboot/test_authvar.py b/test/py/tests/test_efi_secboot/test_authvar.py
index 359adba4b4b7..d0c6b9035b1b 100644
--- a/test/py/tests/test_efi_secboot/test_authvar.py
+++ b/test/py/tests/test_efi_secboot/test_authvar.py
@@ -9,7 +9,6 @@ This test verifies variable authentication
 """
 
 import pytest
-from defs import *
 
 
 @pytest.mark.boardspec('sandbox')
@@ -29,18 +28,18 @@ class TestEfiAuthVar(object):
             output = u_boot_console.run_command_list([
                 'host bind 0 %s' % disk_img,
                 'printenv -e SecureBoot'])
-            assert('00000000: 00' in ''.join(output))
+            assert '00000000: 00' in ''.join(output)
 
             output = u_boot_console.run_command(
                 'printenv -e SetupMode')
-            assert('00000000: 01' in output)
+            assert '00000000: 01' in output
 
         with u_boot_console.log.section('Test Case 1b'):
             # Test Case 1b, PK without AUTHENTICATED_WRITE_ACCESS
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -i 4000000,$filesize PK'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 1c'):
             # Test Case 1c, install PK
@@ -48,79 +47,79 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK',
                 'printenv -e -n PK'])
-            assert('PK:' in ''.join(output))
+            assert 'PK:' in ''.join(output)
 
             output = u_boot_console.run_command(
                 'printenv -e SecureBoot')
-            assert('00000000: 01' in output)
+            assert '00000000: 01' in output
             output = u_boot_console.run_command(
                 'printenv -e SetupMode')
-            assert('00000000: 00' in output)
+            assert '00000000: 00' in output
 
         with u_boot_console.log.section('Test Case 1d'):
             # Test Case 1d, db/dbx without KEK
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 1e'):
             # Test Case 1e, install KEK
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 KEK.auth',
                 'setenv -e -nv -bs -rt -i 4000000,$filesize KEK'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 KEK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'printenv -e -n KEK'])
-            assert('KEK:' in ''.join(output))
+            assert 'KEK:' in ''.join(output)
 
             output = u_boot_console.run_command(
                 'printenv -e SecureBoot')
-            assert('00000000: 01' in output)
+            assert '00000000: 01' in output
 
         with u_boot_console.log.section('Test Case 1f'):
             # Test Case 1f, install db
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -i 4000000,$filesize db'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'db:' in ''.join(output)
 
             output = u_boot_console.run_command(
                 'printenv -e SecureBoot')
-            assert('00000000: 01' in output)
+            assert '00000000: 01' in output
 
         with u_boot_console.log.section('Test Case 1g'):
             # Test Case 1g, install dbx
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 dbx.auth',
                 'setenv -e -nv -bs -rt -i 4000000,$filesize dbx'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 dbx.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f dbx'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('dbx:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'dbx:' in ''.join(output)
 
             output = u_boot_console.run_command(
                 'printenv -e SecureBoot')
-            assert('00000000: 01' in output)
+            assert '00000000: 01' in output
 
     def test_efi_var_auth2(self, u_boot_console, efi_boot_env):
         """
@@ -139,20 +138,20 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'db:' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db1.auth',
                 'setenv -e -nv -bs -rt -i 4000000,$filesize db'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 2b'):
             # Test Case 2b, update without correct signature
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.esl',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 2c'):
             # Test Case 2c, update with correct signature
@@ -160,8 +159,8 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 db1.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'db:' in ''.join(output)
 
     def test_efi_var_auth3(self, u_boot_console, efi_boot_env):
         """
@@ -180,20 +179,20 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'db:' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db1.auth',
                 'setenv -e -nv -bs -rt -a -i 4000000,$filesize db'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 3b'):
             # Test Case 3b, update without correct signature
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.esl',
                 'setenv -e -nv -bs -rt -at -a -i 4000000,$filesize db'])
-            assert('Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 3c'):
             # Test Case 3c, update with correct signature
@@ -201,8 +200,8 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 db1.auth',
                 'setenv -e -nv -bs -rt -at -a -i 4000000,$filesize db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'db:' in ''.join(output)
 
     def test_efi_var_auth4(self, u_boot_console, efi_boot_env):
         """
@@ -221,22 +220,22 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'db:' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'setenv -e -nv -bs -rt db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert('Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
+            assert 'db:' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 4b'):
             # Test Case 4b, update without correct signature/data
             output = u_boot_console.run_command_list([
                 'setenv -e -nv -bs -rt -at db',
                 'printenv -e -n -guid d719b2cb-3d3a-4596-a3bc-dad00e67656f db'])
-            assert('Failed to set EFI variable' in ''.join(output))
-            assert('db:' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
+            assert 'db:' in ''.join(output)
 
     def test_efi_var_auth5(self, u_boot_console, efi_boot_env):
         """
@@ -255,15 +254,15 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'printenv -e -n PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('PK:' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert 'PK:' in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 PK_null.esl',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK',
                 'printenv -e -n PK'])
-            assert('Failed to set EFI variable' in ''.join(output))
-            assert('PK:' in ''.join(output))
+            assert 'Failed to set EFI variable' in ''.join(output)
+            assert 'PK:' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 5b'):
             # Test Case 5b, Uninstall PK with correct signature
@@ -271,12 +270,12 @@ class TestEfiAuthVar(object):
                 'fatload host 0:1 4000000 PK_null.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK',
                 'printenv -e -n PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
-            assert('\"PK\" not defined' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            assert '\"PK\" not defined' in ''.join(output)
 
             output = u_boot_console.run_command(
                 'printenv -e SecureBoot')
-            assert('00000000: 00' in output)
+            assert '00000000: 00' in output
             output = u_boot_console.run_command(
                 'printenv -e SetupMode')
-            assert('00000000: 01' in output)
+            assert '00000000: 01' in output
diff --git a/test/py/tests/test_efi_secboot/test_signed.py b/test/py/tests/test_efi_secboot/test_signed.py
index c100832a2375..02cfa6480f26 100644
--- a/test/py/tests/test_efi_secboot/test_signed.py
+++ b/test/py/tests/test_efi_secboot/test_signed.py
@@ -9,7 +9,6 @@ This test verifies image authentication for signed images.
 """
 
 import pytest
-from defs import *
 
 
 @pytest.mark.boardspec('sandbox')
@@ -32,7 +31,7 @@ class TestEfiSignedImage(object):
                 'efidebug boot add 1 HELLO1 host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('Hello, world!' in ''.join(output))
+            assert 'Hello, world!' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 1b'):
             # Test Case 1b, run unsigned image if no PK
@@ -40,7 +39,7 @@ class TestEfiSignedImage(object):
                 'efidebug boot add 2 HELLO2 host 0:1 /helloworld.efi ""',
                 'efidebug boot next 2',
                 'bootefi bootmgr'])
-            assert('Hello, world!' in ''.join(output))
+            assert 'Hello, world!' in ''.join(output)
 
     def test_efi_signed_image_auth2(self, u_boot_console, efi_boot_env):
         """
@@ -57,35 +56,35 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO1 host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO1\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO1\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 2 HELLO2 host 0:1 /helloworld.efi ""',
                 'efidebug boot next 2',
                 'efidebug test bootmgr'])
-            assert('\'HELLO2\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO2\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 2b'):
             # Test Case 2b, authenticated by db
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 2',
                 'efidebug test bootmgr'])
-            assert('\'HELLO2\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO2\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('Hello, world!' in ''.join(output))
+            assert 'Hello, world!' in ''.join(output)
 
     def test_efi_signed_image_auth3(self, u_boot_console, efi_boot_env):
         """
@@ -103,25 +102,25 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 3b'):
             # Test Case 3b, rejected by dbx even if db allows
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
     def test_efi_signed_image_auth4(self, u_boot_console, efi_boot_env):
         """
@@ -141,13 +140,13 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
     def test_efi_signed_image_auth5(self, u_boot_console, efi_boot_env):
         """
@@ -167,38 +166,38 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 5b'):
             # Test Case 5b, authenticated if both signatures are verified
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db1.auth',
                 'setenv -e -nv -bs -rt -at -a -i 4000000,$filesize db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('Hello, world!' in ''.join(output))
+            assert 'Hello, world!' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 5c'):
             # Test Case 5c, rejected if any of signatures is revoked
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 dbx_hash1.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
     def test_efi_signed_image_auth6(self, u_boot_console, efi_boot_env):
         """
@@ -216,24 +215,24 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('Hello, world!' in ''.join(output))
+            assert 'Hello, world!' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 6b'):
             # Test Case 6b, rejected by TEST_db certificate in dbx
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 dbx_db.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
 
         with u_boot_console.log.section('Test Case 6c'):
             # Test Case 6c, rejected by image's digest in dbx
@@ -242,9 +241,9 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
                 'fatload host 0:1 4000000 dbx_hello_signed.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
-            assert('efi_start_image() returned: 26' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
diff --git a/test/py/tests/test_efi_secboot/test_unsigned.py b/test/py/tests/test_efi_secboot/test_unsigned.py
index 3748b51ee7e9..c4c3f4c2023f 100644
--- a/test/py/tests/test_efi_secboot/test_unsigned.py
+++ b/test/py/tests/test_efi_secboot/test_unsigned.py
@@ -9,7 +9,6 @@ This test verifies image authentication for unsigned images.
 """
 
 import pytest
-from defs import *
 
 
 @pytest.mark.boardspec('sandbox')
@@ -33,18 +32,18 @@ class TestEfiUnsignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('efi_start_image() returned: 26' in ''.join(output))
-            assert(not 'Hello, world!' in ''.join(output))
+            assert 'efi_start_image() returned: 26' in ''.join(output)
+            assert 'Hello, world!' not in ''.join(output)
 
     def test_efi_unsigned_image_auth2(self, u_boot_console, efi_boot_env):
         """
@@ -62,13 +61,13 @@ class TestEfiUnsignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('Hello, world!' in ''.join(output))
+            assert 'Hello, world!' in ''.join(output)
 
     def test_efi_unsigned_image_auth3(self, u_boot_console, efi_boot_env):
         """
@@ -86,33 +85,33 @@ class TestEfiUnsignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
                 'fatload host 0:1 4000000 PK.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('efi_start_image() returned: 26' in ''.join(output))
-            assert(not 'Hello, world!' in ''.join(output))
+            assert 'efi_start_image() returned: 26' in ''.join(output)
+            assert 'Hello, world!' not in ''.join(output)
 
         with u_boot_console.log.section('Test Case 3b'):
             # Test Case 3b, rejected by dbx even if db allows
             output = u_boot_console.run_command_list([
                 'fatload host 0:1 4000000 db_hello.auth',
                 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db'])
-            assert(not 'Failed to set EFI variable' in ''.join(output))
+            assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
                 'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
-            assert('\'HELLO\' failed' in ''.join(output))
+            assert '\'HELLO\' failed' in ''.join(output)
             output = u_boot_console.run_command_list([
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
-            assert('efi_start_image() returned: 26' in ''.join(output))
-            assert(not 'Hello, world!' in ''.join(output))
+            assert 'efi_start_image() returned: 26' in ''.join(output)
+            assert 'Hello, world!' not in ''.join(output)
