Update app.py

app.py

@@ -29,7 +29,7 @@ def encode_image(image):
     else:
         # 处理PIL.Image对象的情况
         buffered = BytesIO()
-        image.save(buffered, format=image.format if hasattr(image, 'format') else 'PNG')
+        image.save(buffered, format='PNG')
         return base64.b64encode(buffered.getvalue()).decode('utf-8')
 
 def excute_codes(codes, messages, executor: PythonExecutor):