diff --git a/build-checks.py b/build-checks.py
index dcfb8fb7..88ba4281 100755
--- a/build-checks.py
+++ b/build-checks.py
@@ -21,7 +21,7 @@ def checkCSVcolumnCount():
             reader = csv.reader(open(f, "r"))
             for row in reader:
                 if not len(row) == 6:
-                    print("{}: Insufficient columns of data - {}".format(filename, row))
+                    print(f"{filename}: Insufficient columns of data - {row}")
                     missing_csv_field = True
                     continue
 
@@ -30,6 +30,7 @@ def checkCSVcolumnCount():
     else:
         return 0
 
+
 def checkFilenameLengths():
     print("SOUNDS: Checking file name lengths ...")
     invalid_filename_found = False
@@ -38,12 +39,12 @@ def checkFilenameLengths():
             path = os.path.join(dirpath, fn)
             if path.split(os.path.sep)[2] == "SYSTEM":
                 if len(os.path.splitext(fn)[0]) > 8:
-                    print("Filename too long for a SYSTEM file: {}".format(path))
+                    print(f"Filename too long for a SYSTEM file: {path}")
                     invalid_filename_found = True
             elif path.split(os.path.sep)[2] == "SCRIPTS":
                 continue
             elif len(os.path.splitext(fn)[0]) > 6:
-                print("Filename too long for a non-SYSTEM file: {}".format(path))
+                print(f"Filename too long for a non-SYSTEM file: {path}")
                 invalid_filename_found = True
 
     if invalid_filename_found:
@@ -60,7 +61,7 @@ def checkNoZeroByteFiles():
         for fn in files:
             path = os.path.join(root, fn)
             if os.stat(path).st_size == 0:
-                print("Zero byte file: {}".format(path))
+                print(f"Zero byte file: {path}")
                 zero_byte_file_found = True
 
     if zero_byte_file_found:
@@ -76,7 +77,7 @@ def validateSoundsJson():
     try:
         json.load(f)
     except ValueError as err:
-        print("JSON not valid: {}".format(str(err)))
+        print(f"JSON not valid: {str(err)}")
         invalid_json_found = True
 
     if invalid_json_found:
@@ -84,6 +85,7 @@ def validateSoundsJson():
     else:
         return 0
 
+
 def checkForDuplicateStringID():
     print("VOICES: Check for duplicate StringIDs ...")
     duplicate_found = False
@@ -111,7 +113,7 @@ def checkForDuplicateStringID():
                     else:
                         StringID = row[0]
                         if StringID in StringID_count.keys():
-                            print('{}: {} is duplicated'.format(f, StringID))
+                            print(f'{f}: {StringID} is duplicated')
                             StringID_count[StringID] = StringID_count[StringID] + 1
                             duplicate_found = True
                         else:
diff --git a/voice-gen.py b/voice-gen.py
index 05556aa6..b552a85b 100755
--- a/voice-gen.py
+++ b/voice-gen.py
@@ -5,7 +5,6 @@
 import re
 import sys
 import time
-import subprocess
 from pathlib import Path
 
 try:
@@ -17,7 +16,6 @@
     https://docs.microsoft.com/azure/cognitive-services/speech-service/quickstart-text-to-speech-python for
     installation instructions.
     """)
-    import sys
     sys.exit(1)
 
 
@@ -125,7 +123,7 @@ def main() -> None:
 
     speech_config = speechsdk.SpeechConfig(subscription=speech_key, region=service_region)
 
-    if not(os.path.isfile(csv_file)):
+    if not os.path.isfile(csv_file):
         print("Error: voice file not found")
         sys.exit(1)
 
@@ -181,11 +179,9 @@ def main() -> None:
                     # If failed, show error, remove empty/corrupt file and halt
                     if result.reason == speechsdk.ResultReason.Canceled:
                         cancellation_details = result.cancellation_details
-                        print("Speech synthesis canceled: {}".format(
-                            cancellation_details.reason))
+                        print(f"Speech synthesis canceled: {cancellation_details.reason}")
                         if cancellation_details.reason == speechsdk.CancellationReason.Error:
-                            print("Error details: {}".format(
-                                cancellation_details.error_details))
+                            print(f"Error details: {cancellation_details.error_details}")
                         if os.path.isfile(outdir + os.sep + filename):
                             os.remove(outdir + os.sep + filename)
                         sys.exit(1)