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

2 files changed, 17 insertions, 16 deletions

diff --git a/examples/sharding/__init__.py b/examples/sharding/__init__.py
index 59d26a217..eb8e10686 100644
--- a/examples/sharding/__init__.py
+++ b/examples/sharding/__init__.py
@@ -8,7 +8,7 @@ The basic components of a "sharded" mapping are:
 * a function which can return a single shard id, given an instance
   to be saved; this is called "shard_chooser"
 * a function which can return a list of shard ids which apply to a particular
-  instance identifier; this is called "id_chooser".  If it returns all shard ids,
+  instance identifier; this is called "id_chooser".If it returns all shard ids,
   all shards will be searched.
 * a function which can return a list of shard ids to try, given a particular
   Query ("query_chooser").  If it returns all shard ids, all shards will be
diff --git a/examples/sharding/attribute_shard.py b/examples/sharding/attribute_shard.py
index 48a3dc932..608f0f9c3 100644
--- a/examples/sharding/attribute_shard.py
+++ b/examples/sharding/attribute_shard.py
@@ -1,20 +1,21 @@
-from sqlalchemy import (
-    create_engine,
-    Table,
-    Column,
-    Integer,
-    String,
-    ForeignKey,
-    Float,
-    DateTime,
-)
-from sqlalchemy.orm import sessionmaker, relationship
-from sqlalchemy.ext.horizontal_shard import ShardedSession
-from sqlalchemy.sql import operators, visitors
-from sqlalchemy.ext.declarative import declarative_base
+import datetime
+
+from sqlalchemy import Column
+from sqlalchemy import create_engine
+from sqlalchemy import DateTime
+from sqlalchemy import Float
+from sqlalchemy import ForeignKey
 from sqlalchemy import inspect
+from sqlalchemy import Integer
+from sqlalchemy import String
+from sqlalchemy import Table
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.ext.horizontal_shard import ShardedSession
+from sqlalchemy.orm import relationship
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.sql import operators
+from sqlalchemy.sql import visitors
 
-import datetime
 
 # db1 is used for id generation. The "pool_threadlocal"
 # causes the id_generator() to use the same connection as that