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

1 files changed, 47 insertions, 52 deletions

diff --git a/lib/sqlalchemy/sql/selectable.py b/lib/sqlalchemy/sql/selectable.py
index 1f1800514..beba1d242 100644
--- a/lib/sqlalchemy/sql/selectable.py
+++ b/lib/sqlalchemy/sql/selectable.py
@@ -10,50 +10,45 @@ SQL tables and derived rowsets.
 
 """
 
-from .elements import (
-    ClauseElement,
-    TextClause,
-    ClauseList,
-    and_,
-    Grouping,
-    UnaryExpression,
-    literal_column,
-    BindParameter,
-)
-from .elements import (
-    _clone,
-    _literal_as_text,
-    _interpret_as_column_or_from,
-    _expand_cloned,
-    _select_iterables,
-    _anonymous_label,
-    _clause_element_as_expr,
-    _cloned_intersection,
-    _cloned_difference,
-    True_,
-    _literal_as_label_reference,
-    _literal_and_labels_as_label_reference,
-)
-from .base import (
-    Immutable,
-    Executable,
-    _generative,
-    ColumnCollection,
-    ColumnSet,
-    _from_objects,
-    Generative,
-)
-from . import type_api
-from .. import inspection
-from .. import util
-from .. import exc
-from operator import attrgetter
-from . import operators
-import operator
 import collections
-from .annotation import Annotated
 import itertools
+import operator
+from operator import attrgetter
+
 from sqlalchemy.sql.visitors import Visitable
+from . import operators
+from . import type_api
+from .annotation import Annotated
+from .base import _from_objects
+from .base import _generative
+from .base import ColumnCollection
+from .base import ColumnSet
+from .base import Executable
+from .base import Generative
+from .base import Immutable
+from .elements import _anonymous_label
+from .elements import _clause_element_as_expr
+from .elements import _clone
+from .elements import _cloned_difference
+from .elements import _cloned_intersection
+from .elements import _expand_cloned
+from .elements import _interpret_as_column_or_from
+from .elements import _literal_and_labels_as_label_reference
+from .elements import _literal_as_label_reference
+from .elements import _literal_as_text
+from .elements import _select_iterables
+from .elements import and_
+from .elements import BindParameter
+from .elements import ClauseElement
+from .elements import ClauseList
+from .elements import Grouping
+from .elements import literal_column
+from .elements import TextClause
+from .elements import True_
+from .elements import UnaryExpression
+from .. import exc
+from .. import inspection
+from .. import util
 
 
 def _interpret_as_from(element):
@@ -1013,15 +1008,15 @@ class Join(FromClause):
         to join, or no way to join, an error is raised.
 
         :param ignore_nonexistent_tables:  Deprecated - this
-        flag is no longer used.  Only resolution errors regarding
-        the two given tables are propagated.
+         flag is no longer used.  Only resolution errors regarding
+         the two given tables are propagated.
 
         :param a_subset: An optional expression that is a sub-component
-        of ``a``.  An attempt will be made to join to just this sub-component
-        first before looking at the full ``a`` construct, and if found
-        will be successful even if there are other ways to join to ``a``.
-        This allows the "right side" of a join to be passed thereby
-        providing a "natural join".
+         of ``a``.  An attempt will be made to join to just this sub-component
+         first before looking at the full ``a`` construct, and if found
+         will be successful even if there are other ways to join to ``a``.
+         This allows the "right side" of a join to be passed thereby
+         providing a "natural join".
 
         """
         constraints = cls._joincond_scan_left_right(
@@ -1441,8 +1436,8 @@ class TableSample(Alias):
     """Represent a TABLESAMPLE clause.
 
     This object is constructed from the :func:`~.expression.tablesample` module
-    level function as well as the :meth:`.FromClause.tablesample` method available
-    on all :class:`.FromClause` subclasses.
+    level function as well as the :meth:`.FromClause.tablesample` method
+    available on all :class:`.FromClause` subclasses.
 
     .. versionadded:: 1.1
 
@@ -2813,8 +2808,8 @@ class Select(HasPrefixes, HasSuffixes, GenerativeSelect):
           a numerical value which usually renders as a ``LIMIT``
           expression in the resulting select.  Backends that don't
           support ``LIMIT`` will attempt to provide similar
-          functionality.    This parameter is typically specified more naturally
-          using the :meth:`.Select.limit` method on an existing
+          functionality.    This parameter is typically specified more
+          naturally using the :meth:`.Select.limit` method on an existing
           :class:`.Select`.
 
           .. seealso::