2 files changed, 11 insertions, 8 deletions
diff --git a/django/contrib/gis/db/models/sql/__init__.py b/django/contrib/gis/db/models/sql/__init__.py
index 850c644d5d..1376e8d7d1 100644
--- a/django/contrib/gis/db/models/sql/__init__.py
+++ b/django/contrib/gis/db/models/sql/__init__.py
@@ -1,7 +1,6 @@
-from django.contrib.gis.db.models.sql.conversion import (
-    AreaField, DistanceField,
-)
+from django.contrib.gis.db.models.sql.conversion import AreaField, DistanceField
 
 __all__ = [
-    'AreaField', 'DistanceField',
+    "AreaField",
+    "DistanceField",
 ]
diff --git a/django/contrib/gis/db/models/sql/conversion.py b/django/contrib/gis/db/models/sql/conversion.py
index 99ab51e239..be712319fb 100644
--- a/django/contrib/gis/db/models/sql/conversion.py
+++ b/django/contrib/gis/db/models/sql/conversion.py
@@ -10,13 +10,14 @@ from django.db import models
 
 class AreaField(models.FloatField):
     "Wrapper for Area values."
+
     def __init__(self, geo_field):
         super().__init__()
         self.geo_field = geo_field
 
     def get_prep_value(self, value):
         if not isinstance(value, Area):
-            raise ValueError('AreaField only accepts Area measurement objects.')
+            raise ValueError("AreaField only accepts Area measurement objects.")
         return value
 
     def get_db_prep_value(self, value, connection, prepared=False):
@@ -37,11 +38,12 @@ class AreaField(models.FloatField):
         return Area(**{area_att: value}) if area_att else value
 
     def get_internal_type(self):
-        return 'AreaField'
+        return "AreaField"
 
 
 class DistanceField(models.FloatField):
     "Wrapper for Distance values."
+
     def __init__(self, geo_field):
         super().__init__()
         self.geo_field = geo_field
@@ -56,7 +58,9 @@ class DistanceField(models.FloatField):
             return value
         distance_att = connection.ops.get_distance_att_for_field(self.geo_field)
         if not distance_att:
-            raise ValueError('Distance measure is supplied, but units are unknown for result.')
+            raise ValueError(
+                "Distance measure is supplied, but units are unknown for result."
+            )
         return getattr(value, distance_att)
 
     def from_db_value(self, value, expression, connection):
@@ -66,4 +70,4 @@ class DistanceField(models.FloatField):
         return Distance(**{distance_att: value}) if distance_att else value
 
     def get_internal_type(self):
-        return 'DistanceField'
+        return "DistanceField"