Fix python3.x unicode issue;

hupantingxue · hupantingxue · commit 070b9cf051ab · 2014-12-02T20:36:01.000+08:00
diff --git a/jpush/device/entity.py b/jpush/device/entity.py
@@ -1,7 +1,8 @@
 #!/usr/bin/env python
 #-*- coding:utf8 -*-
+import sys
 
-if not unicode:
+if 2 != sys.version_info[0]:
     unicode = str
 
 def add(*types):
