8 files changed, 17 insertions, 20 deletions
diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index af575c6b30..8e442c4a7a 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -4,11 +4,10 @@ from django.contrib.postgres import lookups
 from django.contrib.postgres.forms import SimpleArrayField
 from django.contrib.postgres.validators import ArrayMaxLengthValidator
 from django.core import checks, exceptions
-from django.db.models import Field, Transform, IntegerField
+from django.db.models import Field, IntegerField, Transform
 from django.utils import six
 from django.utils.translation import string_concat, ugettext_lazy as _
 
-
 __all__ = ['ArrayField']
 
 
diff --git a/django/contrib/postgres/fields/hstore.py b/django/contrib/postgres/fields/hstore.py
index 1524368ecf..461fa047e2 100644
--- a/django/contrib/postgres/fields/hstore.py
+++ b/django/contrib/postgres/fields/hstore.py
@@ -3,11 +3,10 @@ import json
 from django.contrib.postgres import forms, lookups
 from django.contrib.postgres.fields.array import ArrayField
 from django.core import exceptions
-from django.db.models import Field, Transform, TextField
+from django.db.models import Field, TextField, Transform
 from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 
-
 __all__ = ['HStoreField']
 
 
diff --git a/django/contrib/postgres/fields/ranges.py b/django/contrib/postgres/fields/ranges.py
index 8cb5229593..679e87f44e 100644
--- a/django/contrib/postgres/fields/ranges.py
+++ b/django/contrib/postgres/fields/ranges.py
@@ -1,12 +1,11 @@
 import json
 
-from django.contrib.postgres import lookups, forms
+from psycopg2.extras import DateRange, DateTimeTZRange, NumericRange, Range
+
+from django.contrib.postgres import forms, lookups
 from django.db import models
 from django.utils import six
 
-from psycopg2.extras import Range, NumericRange, DateRange, DateTimeTZRange
-
-
 __all__ = [
     'RangeField', 'IntegerRangeField', 'BigIntegerRangeField',
     'FloatRangeField', 'DateTimeRangeField', 'DateRangeField',
diff --git a/django/contrib/postgres/forms/array.py b/django/contrib/postgres/forms/array.py
index 0bd4ee4916..01c4d53527 100644
--- a/django/contrib/postgres/forms/array.py
+++ b/django/contrib/postgres/forms/array.py
@@ -1,10 +1,12 @@
 import copy
 
-from django.contrib.postgres.validators import ArrayMinLengthValidator, ArrayMaxLengthValidator
-from django.core.exceptions import ValidationError
 from django import forms
-from django.utils.safestring import mark_safe
+from django.contrib.postgres.validators import (
+    ArrayMaxLengthValidator, ArrayMinLengthValidator,
+)
+from django.core.exceptions import ValidationError
 from django.utils import six
+from django.utils.safestring import mark_safe
 from django.utils.translation import string_concat, ugettext_lazy as _
 
 
diff --git a/django/contrib/postgres/forms/hstore.py b/django/contrib/postgres/forms/hstore.py
index 548be0f570..2c564ea53c 100644
--- a/django/contrib/postgres/forms/hstore.py
+++ b/django/contrib/postgres/forms/hstore.py
@@ -5,7 +5,6 @@ from django.core.exceptions import ValidationError
 from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 
-
 __all__ = ['HStoreField']
 
 
diff --git a/django/contrib/postgres/forms/ranges.py b/django/contrib/postgres/forms/ranges.py
index 23db4fe514..80ea8299c9 100644
--- a/django/contrib/postgres/forms/ranges.py
+++ b/django/contrib/postgres/forms/ranges.py
@@ -1,11 +1,10 @@
-from django.core import exceptions
+from psycopg2.extras import DateRange, DateTimeTZRange, NumericRange
+
 from django import forms
+from django.core import exceptions
 from django.forms.widgets import MultiWidget
 from django.utils.translation import ugettext_lazy as _
 
-from psycopg2.extras import NumericRange, DateRange, DateTimeTZRange
-
-
 __all__ = ['IntegerRangeField', 'FloatRangeField', 'DateTimeRangeField', 'DateRangeField']
 
 
diff --git a/django/contrib/postgres/signals.py b/django/contrib/postgres/signals.py
index 602dd08700..183ba1d983 100644
--- a/django/contrib/postgres/signals.py
+++ b/django/contrib/postgres/signals.py
@@ -1,8 +1,8 @@
-from django.utils import six
-
 from psycopg2 import ProgrammingError
 from psycopg2.extras import register_hstore
 
+from django.utils import six
+
 
 def register_hstore_handler(connection, **kwargs):
     if connection.vendor != 'postgresql':
diff --git a/django/contrib/postgres/validators.py b/django/contrib/postgres/validators.py
index 49ec921db1..3f576873f4 100644
--- a/django/contrib/postgres/validators.py
+++ b/django/contrib/postgres/validators.py
@@ -2,11 +2,11 @@ import copy
 
 from django.core.exceptions import ValidationError
 from django.core.validators import (
-    MaxLengthValidator, MinLengthValidator, MaxValueValidator,
+    MaxLengthValidator, MaxValueValidator, MinLengthValidator,
     MinValueValidator,
 )
 from django.utils.deconstruct import deconstructible
-from django.utils.translation import ungettext_lazy, ugettext_lazy as _
+from django.utils.translation import ugettext_lazy as _, ungettext_lazy
 
 
 class ArrayMaxLengthValidator(MaxLengthValidator):