Post black reformatting

Applied on top of a pure run of black -l 79 in
I7eda77fed3d8e73df84b3651fd6cfcfe858d4dc9,  this set of changes
resolves all remaining flake8 conditions for those codes
we have enabled in setup.cfg.

Included are resolutions for all remaining flake8 issues
including shadowed builtins, long lines, import order, unused
imports, duplicate imports, and docstring issues.

Change-Id: I4f72d3ba1380dd601610ff80b8fb06a2aff8b0fe

4 files changed, 58 insertions, 60 deletions

diff --git a/examples/versioned_rows/versioned_map.py b/examples/versioned_rows/versioned_map.py
index 46bdbb783..9abbb3e09 100644
--- a/examples/versioned_rows/versioned_map.py
+++ b/examples/versioned_rows/versioned_map.py
@@ -28,20 +28,22 @@ those additional values.
 
 """
 
-from sqlalchemy import Column, String, Integer, ForeignKey, create_engine
-from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import (
-    attributes,
-    relationship,
-    backref,
-    sessionmaker,
-    make_transient,
-    validates,
-    Session,
-)
+from sqlalchemy import Column
+from sqlalchemy import create_engine
+from sqlalchemy import event
+from sqlalchemy import ForeignKey
+from sqlalchemy import Integer
+from sqlalchemy import String
 from sqlalchemy.ext.associationproxy import association_proxy
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import attributes
+from sqlalchemy.orm import backref
+from sqlalchemy.orm import make_transient
+from sqlalchemy.orm import relationship
+from sqlalchemy.orm import Session
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.orm import validates
 from sqlalchemy.orm.collections import attribute_mapped_collection
-from sqlalchemy import event
 
 
 @event.listens_for(Session, "before_flush")
diff --git a/examples/versioned_rows/versioned_rows.py b/examples/versioned_rows/versioned_rows.py
index 03e1c3510..01067431c 100644
--- a/examples/versioned_rows/versioned_rows.py
+++ b/examples/versioned_rows/versioned_rows.py
@@ -3,17 +3,19 @@ an UPDATE statement on a single row into an INSERT statement, so that a new
 row is inserted with the new data, keeping the old row intact.
 
 """
-from sqlalchemy.orm import (
-    sessionmaker,
-    relationship,
-    make_transient,
-    backref,
-    Session,
-)
-from sqlalchemy import Column, ForeignKey, create_engine, Integer, String
+from sqlalchemy import Column
+from sqlalchemy import create_engine
+from sqlalchemy import event
+from sqlalchemy import ForeignKey
+from sqlalchemy import Integer
+from sqlalchemy import String
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import attributes
-from sqlalchemy import event
+from sqlalchemy.orm import backref
+from sqlalchemy.orm import make_transient
+from sqlalchemy.orm import relationship
+from sqlalchemy.orm import Session
+from sqlalchemy.orm import sessionmaker
 
 
 class Versioned(object):
diff --git a/examples/versioned_rows/versioned_rows_w_versionid.py b/examples/versioned_rows/versioned_rows_w_versionid.py
index 5fd6f9fc4..4861fb366 100644
--- a/examples/versioned_rows/versioned_rows_w_versionid.py
+++ b/examples/versioned_rows/versioned_rows_w_versionid.py
@@ -6,27 +6,23 @@ This example adds a numerical version_id to the Versioned class as well
 as the ability to see which row is the most "current" vesion.
 
 """
-from sqlalchemy.orm import (
-    sessionmaker,
-    relationship,
-    make_transient,
-    backref,
-    Session,
-    column_property,
-)
-from sqlalchemy import (
-    Column,
-    ForeignKeyConstraint,
-    create_engine,
-    Integer,
-    String,
-    Boolean,
-    select,
-    func,
-)
+from sqlalchemy import Boolean
+from sqlalchemy import Column
+from sqlalchemy import create_engine
+from sqlalchemy import event
+from sqlalchemy import ForeignKeyConstraint
+from sqlalchemy import func
+from sqlalchemy import Integer
+from sqlalchemy import select
+from sqlalchemy import String
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import attributes
-from sqlalchemy import event
+from sqlalchemy.orm import backref
+from sqlalchemy.orm import column_property
+from sqlalchemy.orm import make_transient
+from sqlalchemy.orm import relationship
+from sqlalchemy.orm import Session
+from sqlalchemy.orm import sessionmaker
 
 
 class Versioned(object):
diff --git a/examples/versioned_rows/versioned_update_old_row.py b/examples/versioned_rows/versioned_update_old_row.py
index 17c82fdc3..5aa0f424a 100644
--- a/examples/versioned_rows/versioned_update_old_row.py
+++ b/examples/versioned_rows/versioned_update_old_row.py
@@ -5,29 +5,27 @@ to only the most recent version.
 
 """
 
-from sqlalchemy import (
-    create_engine,
-    Integer,
-    String,
-    event,
-    Column,
-    DateTime,
-    inspect,
-    literal,
-)
-from sqlalchemy.orm import (
-    make_transient,
-    Session,
-    relationship,
-    attributes,
-    backref,
-    make_transient_to_detached,
-    Query,
-)
-from sqlalchemy.ext.declarative import declarative_base
 import datetime
 import time
 
+from sqlalchemy import Column
+from sqlalchemy import create_engine
+from sqlalchemy import DateTime
+from sqlalchemy import event
+from sqlalchemy import inspect
+from sqlalchemy import Integer
+from sqlalchemy import literal
+from sqlalchemy import String
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import attributes
+from sqlalchemy.orm import backref
+from sqlalchemy.orm import make_transient
+from sqlalchemy.orm import make_transient_to_detached
+from sqlalchemy.orm import Query
+from sqlalchemy.orm import relationship
+from sqlalchemy.orm import Session
+
+
 Base = declarative_base()
 
 # this will be the current time as the test runs