3 files changed, 4 insertions, 7 deletions
diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index b70ae37a3a..dc5b9b8d6b 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -6,7 +6,6 @@ from django.contrib.postgres.validators import ArrayMaxLengthValidator
 from django.core import checks, exceptions
 from django.db.models import Field, IntegerField, Transform
 from django.db.models.lookups import Exact, In
-from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 
 from ..utils import prefix_validation_error
@@ -98,7 +97,7 @@ class ArrayField(Field):
         return name, path, args, kwargs
 
     def to_python(self, value):
-        if isinstance(value, six.string_types):
+        if isinstance(value, str):
             # Assume we're deserializing
             vals = json.loads(value)
             value = [self.base_field.to_python(val) for val in vals]
diff --git a/django/contrib/postgres/fields/hstore.py b/django/contrib/postgres/fields/hstore.py
index 605deaf62c..fcd212bc4a 100644
--- a/django/contrib/postgres/fields/hstore.py
+++ b/django/contrib/postgres/fields/hstore.py
@@ -4,7 +4,6 @@ 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, TextField, Transform
-from django.utils import six
 from django.utils.encoding import force_text
 from django.utils.translation import ugettext_lazy as _
 
@@ -30,7 +29,7 @@ class HStoreField(Field):
     def validate(self, value, model_instance):
         super(HStoreField, self).validate(value, model_instance)
         for key, val in value.items():
-            if not isinstance(val, six.string_types) and val is not None:
+            if not isinstance(val, str) and val is not None:
                 raise exceptions.ValidationError(
                     self.error_messages['not_a_string'],
                     code='not_a_string',
@@ -38,7 +37,7 @@ class HStoreField(Field):
                 )
 
     def to_python(self, value):
-        if isinstance(value, six.string_types):
+        if isinstance(value, str):
             value = json.loads(value)
         return value
 
diff --git a/django/contrib/postgres/fields/ranges.py b/django/contrib/postgres/fields/ranges.py
index ab7708d288..840417a58f 100644
--- a/django/contrib/postgres/fields/ranges.py
+++ b/django/contrib/postgres/fields/ranges.py
@@ -4,7 +4,6 @@ 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 .utils import AttributeSetter
 
@@ -45,7 +44,7 @@ class RangeField(models.Field):
         return value
 
     def to_python(self, value):
-        if isinstance(value, six.string_types):
+        if isinstance(value, str):
             # Assume we're deserializing
             vals = json.loads(value)
             for end in ('lower', 'upper'):