Fix flake8 errors.

django_downloadview/decorators.py

@@ -9,7 +9,7 @@ from functools import wraps
 
 from django.conf import settings
 from django.core.exceptions import PermissionDenied
-from django.core.signing import TimestampSigner, SignatureExpired, BadSignature
+from django.core.signing import BadSignature, SignatureExpired, TimestampSigner
 
 
 class DownloadDecorator(object):
@@ -42,7 +42,8 @@ class DownloadDecorator(object):
 
 def _signature_is_valid(request):
     """
-    Validator that raises a PermissionDenied error on invalid and mismatching signatures.
+    Validator that raises a PermissionDenied error on invalid and
+    mismatching signatures.
     """
 
     signer = TimestampSigner()

tests/signature.py

@@ -3,7 +3,6 @@ Test signature generation and validation.
 """
 
 import unittest
-from unittest import mock
 
 from django.core.exceptions import PermissionDenied
 from django.core.signing import TimestampSigner
@@ -24,7 +23,7 @@ class SignedTestStorage(SignedURLMixin, TestStorage):
 class SignatureGeneratorTestCase(unittest.TestCase):
     def test_signed_storage(self):
         """
-        django_downloadview.storage.SignedURLMixin adds X-Signature to URLs
+        django_downloadview.storage.SignedURLMixin adds X-Signature to URLs.
         """
 
         storage = SignedTestStorage()
@@ -35,7 +34,8 @@ class SignatureGeneratorTestCase(unittest.TestCase):
 class SignatureValidatorTestCase(unittest.TestCase):
     def test_verify_signature(self):
         """
-        django_downloadview.decorators._signature_is_valid returns True on valid signatures
+        django_downloadview.decorators._signature_is_valid returns True on
+        valid signatures.
         """
 
         signer = TimestampSigner()
@@ -48,7 +48,8 @@ class SignatureValidatorTestCase(unittest.TestCase):
 
     def test_verify_signature_invalid(self):
         """
-        django_downloadview.decorators._signature_is_valid raises PermissionDenied on invalid signatures
+        django_downloadview.decorators._signature_is_valid raises PermissionDenied
+        on invalid signatures.
         """
 
         request = unittest.mock.MagicMock()

tests/views.py

@@ -5,14 +5,12 @@ import os
 import unittest
 from unittest import mock
 
-from django.core.exceptions import PermissionDenied
 from django.core.files import File
 from django.http import Http404
 from django.http.response import HttpResponseNotModified
 import django.test
 
 from django_downloadview import exceptions, views
-from django_downloadview.decorators import signature_required
 from django_downloadview.test import setup_view