[1.9.x] Sorted single letter imports per the latest version of isort.

Backport of 1c8c0837c6 from master

django/db/models/__init__.py

@@ -7,7 +7,7 @@ from django.db.models.deletion import (  # NOQA
     CASCADE, DO_NOTHING, PROTECT, SET, SET_DEFAULT, SET_NULL, ProtectedError,
 )
 from django.db.models.expressions import (  # NOQA
-    F, Case, Expression, ExpressionWrapper, Func, Value, When,
+    Case, Expression, ExpressionWrapper, F, Func, Value, When,
 )
 from django.db.models.fields import *  # NOQA
 from django.db.models.fields.files import FileField, ImageField  # NOQA
@@ -15,7 +15,7 @@ from django.db.models.fields.proxy import OrderWrt  # NOQA
 from django.db.models.fields.subclassing import SubfieldBase  # NOQA
 from django.db.models.lookups import Lookup, Transform  # NOQA
 from django.db.models.manager import Manager  # NOQA
-from django.db.models.query import Q, Prefetch, QuerySet  # NOQA
+from django.db.models.query import Prefetch, Q, QuerySet  # NOQA
 
 # Imports that would create circular imports if sorted
 from django.db.models.base import Model  # NOQA isort:skip

django/db/models/query.py

@@ -16,10 +16,10 @@ from django.db import (
 from django.db.models import sql
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.deletion import Collector
-from django.db.models.expressions import F, Date, DateTime
+from django.db.models.expressions import Date, DateTime, F
 from django.db.models.fields import AutoField
 from django.db.models.query_utils import (
-    Q, InvalidQuery, check_rel_lookup_compatibility, deferred_class_factory,
+    InvalidQuery, Q, check_rel_lookup_compatibility, deferred_class_factory,
 )
 from django.db.models.sql.constants import CURSOR
 from django.utils import six, timezone

django/db/models/sql/query.py

@@ -19,7 +19,7 @@ from django.db.models.constants import LOOKUP_SEP
 from django.db.models.expressions import Col, Ref
 from django.db.models.fields.related_lookups import MultiColSource
 from django.db.models.query_utils import (
-    Q, PathInfo, check_rel_lookup_compatibility, refs_expression,
+    PathInfo, Q, check_rel_lookup_compatibility, refs_expression,
 )
 from django.db.models.sql.constants import (
     INNER, LOUTER, ORDER_DIR, ORDER_PATTERN, QUERY_TERMS, SINGLE,

tests/aggregation/tests.py

@@ -7,7 +7,7 @@ from decimal import Decimal
 from django.core.exceptions import FieldError
 from django.db import connection
 from django.db.models import (
-    F, Aggregate, Avg, Count, DecimalField, DurationField, FloatField, Func,
+    Aggregate, Avg, Count, DecimalField, DurationField, F, FloatField, Func,
     IntegerField, Max, Min, Sum, Value,
 )
 from django.test import TestCase, ignore_warnings

tests/aggregation_regress/tests.py

@@ -9,7 +9,7 @@ from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import FieldError
 from django.db import connection
 from django.db.models import (
-    F, Q, Avg, Count, Max, StdDev, Sum, Value, Variance,
+    Avg, Count, F, Max, Q, StdDev, Sum, Value, Variance,
 )
 from django.test import TestCase, skipUnlessAnyDBFeature, skipUnlessDBFeature
 from django.test.utils import Approximate

tests/annotations/tests.py

@@ -5,7 +5,7 @@ from decimal import Decimal
 
 from django.core.exceptions import FieldDoesNotExist, FieldError
 from django.db.models import (
-    F, BooleanField, CharField, Count, DateTimeField, ExpressionWrapper, Func,
+    BooleanField, CharField, Count, DateTimeField, ExpressionWrapper, F, Func,
     IntegerField, Sum, Value,
 )
 from django.db.models.functions import Lower

tests/delete/tests.py

@@ -8,8 +8,8 @@ from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
 from django.utils.six.moves import range
 
 from .models import (
-    A, M, MR, R, S, T, Avatar, Base, Child, HiddenUser, HiddenUserProfile,
-    M2MFrom, M2MTo, MRNull, Parent, RChild, User, create_a, get_default_r,
+    MR, A, Avatar, Base, Child, HiddenUser, HiddenUserProfile, M, M2MFrom,
+    M2MTo, MRNull, Parent, R, RChild, S, T, User, create_a, get_default_r,
 )
 
 

tests/expressions/tests.py

@@ -11,7 +11,7 @@ from django.db.models.aggregates import (
     Avg, Count, Max, Min, StdDev, Sum, Variance,
 )
 from django.db.models.expressions import (
-    F, Case, Col, Date, DateTime, ExpressionWrapper, Func, OrderBy, Random,
+    Case, Col, Date, DateTime, ExpressionWrapper, F, Func, OrderBy, Random,
     RawSQL, Ref, Value, When,
 )
 from django.db.models.functions import (

tests/expressions_case/tests.py

@@ -8,7 +8,7 @@ from uuid import UUID
 
 from django.core.exceptions import FieldError
 from django.db import connection, models
-from django.db.models import F, Q, Max, Min, Sum, Value
+from django.db.models import F, Max, Min, Q, Sum, Value
 from django.db.models.expressions import Case, When
 from django.test import TestCase
 from django.utils import six

tests/generic_relations_regress/tests.py

@@ -5,7 +5,7 @@ from django.forms.models import modelform_factory
 from django.test import TestCase, skipIfDBFeature
 
 from .models import (
-    A, B, C, D, Address, Board, CharLink, Company, Contact, Content, Developer,
+    A, Address, B, Board, C, CharLink, Company, Contact, Content, D, Developer,
     Guild, HasLinkThing, Link, Node, Note, OddRelation1, OddRelation2,
     Organization, Person, Place, Related, Restaurant, Tag, Team, TextLink,
 )

tests/gis_tests/relatedapp/tests.py

@@ -1,6 +1,6 @@
 from __future__ import unicode_literals
 
-from django.contrib.gis.db.models import F, Collect, Count, Extent, Union
+from django.contrib.gis.db.models import Collect, Count, Extent, F, Union
 from django.contrib.gis.geometry.backend import Geometry
 from django.contrib.gis.geos import GEOSGeometry, MultiPoint, Point
 from django.db import connection

tests/gis_tests/test_measure.py

@@ -5,7 +5,7 @@ and conversions. Here are some tests.
 
 import unittest
 
-from django.contrib.gis.measure import A, D, Area, Distance
+from django.contrib.gis.measure import A, Area, D, Distance
 
 
 class DistanceTest(unittest.TestCase):

tests/queries/tests.py

@@ -8,7 +8,7 @@ from operator import attrgetter
 
 from django.core.exceptions import FieldError
 from django.db import DEFAULT_DB_ALIAS, connection
-from django.db.models import F, Q, Count
+from django.db.models import Count, F, Q
 from django.db.models.sql.constants import LOUTER
 from django.db.models.sql.datastructures import EmptyResultSet
 from django.db.models.sql.where import NothingNode, WhereNode
@@ -18,7 +18,7 @@ from django.utils import six
 from django.utils.six.moves import range
 
 from .models import (
-    FK1, X, Annotation, Article, Author, BaseA, Book, CategoryItem,
+    FK1, Annotation, Article, Author, BaseA, Book, CategoryItem,
     CategoryRelationship, Celebrity, Channel, Chapter, Child, ChildObjectA,
     Classroom, Company, Cover, CustomPk, CustomPkTag, Detail, DumbCategory,
     Eaten, Employment, ExtraInfo, Fan, Food, Identifier, Individual, Item, Job,
@@ -30,7 +30,7 @@ from .models import (
     RelatedIndividual, RelatedObject, Report, ReservedName, Responsibility,
     School, SharedConnection, SimpleCategory, SingleObject, SpecialCategory,
     Staff, StaffUser, Student, Tag, Task, Ticket21203Child, Ticket21203Parent,
-    Ticket23605A, Ticket23605B, Ticket23605C, TvChef, Valid,
+    Ticket23605A, Ticket23605B, Ticket23605C, TvChef, Valid, X,
 )
 
 

tests/select_related_regress/tests.py

@@ -4,7 +4,7 @@ from django.test import TestCase
 from django.utils import six
 
 from .models import (
-    A, B, C, Building, Chick, Child, Class, Client, ClientStatus, Connection,
+    A, B, Building, C, Chick, Child, Class, Client, ClientStatus, Connection,
     Country, Device, Enrollment, Hen, Item, Organizer, Person, Port,
     SpecialClient, State, Student, TUser,
 )

tests/update/tests.py

@@ -2,7 +2,7 @@ from __future__ import unicode_literals
 
 from django.test import TestCase
 
-from .models import A, B, D, Bar, DataPoint, Foo, RelatedPoint
+from .models import A, B, Bar, D, DataPoint, Foo, RelatedPoint
 
 
 class SimpleTest(TestCase):