Adopt review suggestions

python/lc3.py

diff --git a/python/lc3.py b/python/lc3.py
index 6301e8d..e4a5e90 100644
--- a/python/lc3.py
+++ b/python/lc3.py
@@ -66,7 +66,7 @@
 
         if self.frame_duration_us not in [2500, 5000, 7500, 10000]:
             raise InvalidArgumentError(
-                "Invalid frame duration: %.1f ms" % self.frame_duration_us
+                f"Invalid frame duration: {self.frame_duration_us} us ({self.frame_duration_us / 1000:.1f} ms)"
             )
 
         allowed_samplerate = (
@@ -74,7 +74,7 @@
         )
 
         if self.sample_rate_hz not in allowed_samplerate:
-            raise InvalidArgumentError("Invalid sample rate: %d Hz" % sample_rate_hz)
+            raise InvalidArgumentError(f"Invalid sample rate: {sample_rate_hz} Hz")
 
         if libpath is None:
             mesonpy_lib = glob.glob(

python/tools/decoder.py

diff --git a/python/tools/decoder.py b/python/tools/decoder.py
index bc3b554..7cc5127 100755
--- a/python/tools/decoder.py
+++ b/python/tools/decoder.py
@@ -34,8 +34,8 @@
     type=argparse.FileType('wb'), default=sys.stdout.buffer)
 
 parser.add_argument(
-    '--bitdepth',
-    help='Output bitdepth, default is 16 bits',
+    '--bit_depth',
+    help='Output bit depth, default is 16 bits',
     type=int, choices=[16, 24], default=16)
 
 parser.add_argument(
@@ -58,13 +58,13 @@
 
 # --- Setup output ---
 
-bitdepth = args.bitdepth
-pcm_size = nchannels * (bitdepth // 8)
+bit_depth = args.bit_depth
+pcm_size = nchannels * (bit_depth // 8)
 
 f_wav = args.wav_file
 wavfile = wave.open(f_wav)
 wavfile.setnchannels(nchannels)
-wavfile.setsampwidth(bitdepth // 8)
+wavfile.setsampwidth(bit_depth // 8)
 wavfile.setframerate(samplerate)
 wavfile.setnframes(stream_length)
 
@@ -80,7 +80,7 @@
 for i in range(0, encoded_length, frame_length):
 
     lc3_frame_size = struct.unpack('=H', f_lc3.read(2))[0]
-    pcm = dec.decode(f_lc3.read(lc3_frame_size), bit_depth=bitdepth)
+    pcm = dec.decode(f_lc3.read(lc3_frame_size), bit_depth=bit_depth)
 
     pcm = pcm[max(encoded_length - stream_length - i, 0) * pcm_size:
               min(encoded_length - i, frame_length) * pcm_size]

python/tools/encoder.py

diff --git a/python/tools/encoder.py b/python/tools/encoder.py
index 436d769..3246c4c 100755
--- a/python/tools/encoder.py
+++ b/python/tools/encoder.py
@@ -51,7 +51,7 @@
 
 samplerate = wavfile.getframerate()
 nchannels = wavfile.getnchannels()
-bitdepth = wavfile.getsampwidth() * 8
+bit_depth = wavfile.getsampwidth() * 8
 stream_length = wavfile.getnframes()
 
 # --- Setup encoder ---
@@ -77,7 +77,7 @@
     f_lc3.write(struct.pack('=H', frame_size))
 
     pcm = wavfile.readframes(frame_length)
-    f_lc3.write(enc.encode(pcm, frame_size, bit_depth=bitdepth))
+    f_lc3.write(enc.encode(pcm, frame_size, bit_depth=bit_depth))
 
 # --- Cleanup ---