fix a compatibility issue for notebook 5.x

Author: lins05

CHANGES.md

@@ -0,0 +1,9 @@
+# Changelog
+
+## mysql-0.2 2017-11-21
+
+* Fixed a compatibility issue for notebook 5.x
+
+## mysql-0.1 2016-12-04
+
+Port pgcontents to support mysql.

pgcontents/pgmanager.py

@@ -78,7 +78,12 @@ def _checkpoints_class_default(self):
         return PostgresCheckpoints
 
     def _checkpoints_kwargs_default(self):
-        kw = super(PostgresContentsManager, self)._checkpoints_kwargs_default()
+        if hasattr(ContentsManager, '_default_checkpoints_kwargs'):
+            # for newer version of notebook
+            kw = super(PostgresContentsManager, self)._default_checkpoints_kwargs()
+        else:
+            # for older version of notebook
+            kw = super(PostgresContentsManager, self)._checkpoints_kwargs_default()
         kw.update(
             {
                 'db_url': self.db_url,