Update app.py

app.py

@@ -176,7 +176,7 @@ with gr.Blocks() as demo:
         if not json_str:
             return None
         with tempfile.NamedTemporaryFile(
-            mode='w', delete=False, prefix="detection_box_"， suffix='.json', encoding='utf-8'
+            mode='w', delete=False, prefix="detection_box_", suffix='.json', encoding='utf-8'
         ) as f:
             f.write(json_str)
             return f.name