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-rw-r--r--examples/inheritance/single.py2
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diff --git a/examples/inheritance/single.py b/examples/inheritance/single.py
index b445f74a6..22a6fe027 100644
--- a/examples/inheritance/single.py
+++ b/examples/inheritance/single.py
@@ -1,3 +1,5 @@
+"""Single-table inheritance example."""
+
from sqlalchemy import MetaData, Table, Column, Integer, String, \
ForeignKey, create_engine
from sqlalchemy.orm import mapper, relationship, sessionmaker