diff --git "a/product/\345\255\230\345\202\250\344\270\216CDN/\345\257\271\350\261\241\345\255\230\345\202\250 4.0/SDK\346\226\207\346\241\243/Python SDK/\345\257\271\350\261\241\346\223\215\344\275\234/\345\210\240\351\231\244\345\257\271\350\261\241.md" "b/product/\345\255\230\345\202\250\344\270\216CDN/\345\257\271\350\261\241\345\255\230\345\202\250 4.0/SDK\346\226\207\346\241\243/Python SDK/\345\257\271\350\261\241\346\223\215\344\275\234/\345\210\240\351\231\244\345\257\271\350\261\241.md"
index 84dae2e6013f..6e7415521d3b 100644
--- "a/product/\345\255\230\345\202\250\344\270\216CDN/\345\257\271\350\261\241\345\255\230\345\202\250 4.0/SDK\346\226\207\346\241\243/Python SDK/\345\257\271\350\261\241\346\223\215\344\275\234/\345\210\240\351\231\244\345\257\271\350\261\241.md"	
+++ "b/product/\345\255\230\345\202\250\344\270\216CDN/\345\257\271\350\261\241\345\255\230\345\202\250 4.0/SDK\346\226\207\346\241\243/Python SDK/\345\257\271\350\261\241\346\223\215\344\275\234/\345\210\240\351\231\244\345\257\271\350\261\241.md"	
@@ -110,19 +110,19 @@ client = CosS3Client(config)
 
 # 删除指定前缀 (prefix)的文件
 bucket = 'examplebucket-1250000000'
-is_over = False
 marker = ''
 prefix = 'root/logs'
-while not is_over:
+while True:
     response = client.list_objects(Bucket=bucket, Prefix=prefix, Marker=marker)
     if 'Contents' in response:
         for content in response['Contents']:
             print("delete object: ", content['Key'])
             client.delete_object(Bucket=bucket, Key=content['Key'])
 
-        if response['IsTruncated'] == 'false':
-            is_over = True
-            marker = response['Marker']
+    if response['IsTruncated'] == 'false':
+        break
+    
+    marker = response['NextMarker']
 ```
 
 #### 全部参数请求示例