modify demo

dt3310321 · dt3310321 · commit 4fd5075b28d4 · 2018-04-08T16:44:35.000+08:00
diff --git a/qcloud_cos/demo.py b/qcloud_cos/demo.py
@@ -4,6 +4,7 @@
 from qcloud_cos import CosServiceError
 from qcloud_cos import CosClientError
 
+import sys
 import logging
 
 # 腾讯云COSV5Python SDK, 目前可以支持Python2.6与Python2.7
