diff --git a/examples/api/main.py b/examples/api/main.py
index 1395f2f..d407a5d 100644
--- a/examples/api/main.py
+++ b/examples/api/main.py
@@ -97,7 +97,9 @@ async def generate_voice(params: ChatTTSParams):
 
     # zip all of the audio files together
     buf = io.BytesIO()
-    with zipfile.ZipFile(buf, "a", compression=zipfile.ZIP_DEFLATED, allowZip64=False) as f:
+    with zipfile.ZipFile(
+        buf, "a", compression=zipfile.ZIP_DEFLATED, allowZip64=False
+    ) as f:
         for idx, wav in enumerate(wavs):
             f.writestr(wav_arr_to_mp3_view(wav), f"{idx}.mp3")
     logger.info("Audio generation successful.")
diff --git a/examples/cmd/stream.py b/examples/cmd/stream.py
index 75296a1..dd4b9b3 100644
--- a/examples/cmd/stream.py
+++ b/examples/cmd/stream.py
@@ -3,12 +3,13 @@ import threading
 import time
 import random
 
-import pyaudio # please install it manually
+import pyaudio  # please install it manually
 import numpy as np
 import ChatTTS
 
 from tools.audio import batch_unsafe_float_to_int16
 
+
 # 流式声音处理器
 class AudioStreamer:
     def __init__(self):
diff --git a/tools/audio/np.py b/tools/audio/np.py
index 32ba820..527a140 100644
--- a/tools/audio/np.py
+++ b/tools/audio/np.py
@@ -13,6 +13,7 @@ def unsafe_float_to_int16(audio: np.ndarray) -> np.ndarray:
     audio16 = audio.astype(np.int16)
     return audio16
 
+
 @jit
 def batch_unsafe_float_to_int16(audios: list[np.ndarray]) -> list[np.ndarray]:
     """