Lots of fixes to the code examples to specify imports explicitly.

Explicit imports make it easier for users to understand the examples.
Additionally a lot of the examples were fixed to work with the changes in the
0.5.x code base. One small correction to the Case expression.  Thanks a bunch
to Adam Lowry! Fixes #717.

1 files changed, 3 insertions, 2 deletions

diff --git a/examples/vertical/vertical.py b/examples/vertical/vertical.py
index 6c3a61919..4a8bf7787 100644
--- a/examples/vertical/vertical.py
+++ b/examples/vertical/vertical.py
@@ -2,8 +2,9 @@
 represented in distinct database rows.  This allows objects to be created with dynamically changing
 fields that are all persisted in a normalized fashion."""
 
-from sqlalchemy import *
-from sqlalchemy.orm import *
+from sqlalchemy import (create_engine, MetaData, Table, Column, Integer, String,
+    ForeignKey, PickleType, DateTime, and_)
+from sqlalchemy.orm import mapper, relation, sessionmaker, scoped_session
 from sqlalchemy.orm.collections import mapped_collection
 import datetime