diff --git a/Dockerfile.py b/Dockerfile.py
index f5bfc5e..4775487 100755
--- a/Dockerfile.py
+++ b/Dockerfile.py
@@ -48,7 +48,7 @@ def run_and_stream_command_output(command, environment_vars, verbose) -> bool:
                 print(line, end='')
     build_result.wait()
     if build_result.returncode != 0:
-        print("     ::: Error running".format(command))
+        print(f'     ::: Error running: {command}')
         print(build_result.stderr)
     return build_result.returncode == 0
 
diff --git a/test/conftest.py b/test/conftest.py
index 744323d..7b9f6a8 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -23,7 +23,7 @@ def run_and_stream_command_output():
                     print(line, end='')
         build_result.wait()
         if build_result.returncode != 0:
-            print("     ::: Error running".format(command))
+            print(f'     ::: Error running: {command}')
             print(build_result.stderr)
     return run_and_stream_command_output_inner
 
diff --git a/test/test_bash_functions.py b/test/test_bash_functions.py
index 0aef47b..6929c2b 100644
--- a/test/test_bash_functions.py
+++ b/test/test_bash_functions.py
@@ -168,14 +168,14 @@ expected_debian_lines = [
 def test_debian_setup_php_env(Docker, expected_lines, repeat_function):
     ''' confirm all expected output is there and nothing else '''
     stdout = ''
-    for i in range(repeat_function):
+    for _ in range(repeat_function):
         stdout = Docker.run('. /bash_functions.sh ; eval `grep setup_php_env /start.sh`').stdout
     for expected_line in expected_lines:
         search_config_cmd = "grep -c '{}' /etc/lighttpd/conf-enabled/15-fastcgi-php.conf".format(expected_line)
         search_config_count = Docker.run(search_config_cmd)
         found_lines = int(search_config_count.stdout.rstrip('\n'))
         if found_lines > 1:
-            assert False, "Found line {} times (more than once): {}".format(expected_line)
+            assert False, f'Found line {expected_line} times (more than once): {found_lines}'
 
 
 def test_webPassword_random_generation(Docker):