diff --git a/demo/demoproject/compat.py b/demo/demoproject/compat.py
index c1ed757..5e2dc71 100644
--- a/demo/demoproject/compat.py
+++ b/demo/demoproject/compat.py
@@ -3,20 +3,20 @@ from django.utils.version import get_version
 
 
 try:
-    from django.conf.urls import patterns
+    from django.conf.urls import patterns  # noqa
 except ImportError:
     def patterns(prefix, *args):
         return list(args)
 
 try:
-    from django.urls import reverse
+    from django.urls import reverse  # noqa
 except ImportError:
-    from django.core.urlresolvers import reverse
+    from django.core.urlresolvers import reverse  # noqa
 
 if StrictVersion(get_version()) >= StrictVersion('2.0'):
-    from django.conf.urls import include as urlinclude
+    from django.conf.urls import include as urlinclude  # noqa
 
     def include(arg, namespace=None, app_name=None):
         return urlinclude((arg, app_name), namespace=namespace)
 else:
-    from django.conf.urls import include
+    from django.conf.urls import include  # noqa
diff --git a/django_downloadview/files.py b/django_downloadview/files.py
index c6b4e0d..70061f1 100644
--- a/django_downloadview/files.py
+++ b/django_downloadview/files.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 """File wrappers for use as exchange data between views and responses."""
 from __future__ import absolute_import
+
 from io import BytesIO
 from six.moves.urllib.parse import urlparse
 
@@ -122,7 +123,10 @@ class StorageFile(File):
         Proxy to self.storage.accessed_time(self.name).
 
         """
-        return self.storage.accessed(self.name)
+        try:
+            return self.storage.get_accessed_time(self.name)
+        except AttributeError:
+            return self.storage.accessed_time(self.name)
 
     @property
     def created_time(self):
@@ -131,7 +135,10 @@ class StorageFile(File):
         Proxy to self.storage.created_time(self.name).
 
         """
-        return self.storage.created_time(self.name)
+        try:
+            return self.storage.get_created_time(self.name)
+        except AttributeError:
+            return self.storage.created_time(self.name)
 
     @property
     def modified_time(self):
@@ -140,7 +147,10 @@ class StorageFile(File):
         Proxy to self.storage.modified_time(self.name).
 
         """
-        return self.storage.modified_time(self.name)
+        try:
+            return self.storage.get_modified_time(self.name)
+        except AttributeError:
+            return self.storage.modified_time(self.name)
 
 
 class VirtualFile(File):
diff --git a/django_downloadview/io.py b/django_downloadview/io.py
index 1935413..882c87f 100644
--- a/django_downloadview/io.py
+++ b/django_downloadview/io.py
@@ -40,38 +40,38 @@ class TextIteratorIO(io.TextIOBase):
 
     def read(self, n=None):
         """Return content up to ``n`` length."""
-        l = []
+        chunks = []
         if n is None or n < 0:
             while True:
                 m = self._read1()
                 if not m:
                     break
-                l.append(m)
+                chunks.append(m)
         else:
             while n > 0:
                 m = self._read1(n)
                 if not m:
                     break
                 n -= len(m)
-                l.append(m)
-        return u''.join(l)
+                chunks.append(m)
+        return u''.join(chunks)
 
     def readline(self):
-        l = []
+        chunks = []
         while True:
             i = self._left.find(u'\n')
             if i == -1:
-                l.append(self._left)
+                chunks.append(self._left)
                 try:
                     self._left = next(self._iter)
                 except StopIteration:
                     self._left = u''
                     break
             else:
-                l.append(self._left[:i + 1])
+                chunks.append(self._left[:i + 1])
                 self._left = self._left[i + 1:]
                 break
-        return u''.join(l)
+        return u''.join(chunks)
 
 
 class BytesIteratorIO(io.BytesIO):
@@ -108,35 +108,35 @@ class BytesIteratorIO(io.BytesIO):
 
     def read(self, n=None):
         """Return content up to ``n`` length."""
-        l = []
+        chunks = []
         if n is None or n < 0:
             while True:
                 m = self._read1()
                 if not m:
                     break
-                l.append(m)
+                chunks.append(m)
         else:
             while n > 0:
                 m = self._read1(n)
                 if not m:
                     break
                 n -= len(m)
-                l.append(m)
-        return b''.join(l)
+                chunks.append(m)
+        return b''.join(chunks)
 
     def readline(self):
-        l = []
+        chunks = []
         while True:
             i = self._left.find(b'\n')
             if i == -1:
-                l.append(self._left)
+                chunks.append(self._left)
                 try:
                     self._left = next(self._iter)
                 except StopIteration:
                     self._left = b''
                     break
             else:
-                l.append(self._left[:i + 1])
+                chunks.append(self._left[:i + 1])
                 self._left = self._left[i + 1:]
                 break
-        return b''.join(l)
+        return b''.join(chunks)
diff --git a/django_downloadview/views/base.py b/django_downloadview/views/base.py
index 29121c3..c476d83 100644
--- a/django_downloadview/views/base.py
+++ b/django_downloadview/views/base.py
@@ -116,7 +116,8 @@ class DownloadMixin(object):
                 modification_time = calendar.timegm(
                     file_instance.modified_time.utctimetuple())
                 size = file_instance.size
-            except (AttributeError, NotImplementedError):
+            except (AttributeError, NotImplementedError) as e:
+                print("!=======!", e)
                 return True
             else:
                 return was_modified_since(since, modification_time, size)
diff --git a/tox.ini b/tox.ini
index e2e6130..fcf97dc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,9 +11,6 @@ envlist = py{27}-django{18,19,110,111},
 
 [travis:env]
 DJANGO =
-    1.8: django18
-    1.9: django19
-    1.10: django110
     1.11: django111
     2.0: django20
     2.1: django21