[py3] Replaced basestring by six.string_types.

1 files changed, 2 insertions, 1 deletions

diff --git a/django/db/models/fields/files.py b/django/db/models/fields/files.py
index b0dce381a6..d3f1327315 100644
--- a/django/db/models/fields/files.py
+++ b/django/db/models/fields/files.py
@@ -9,6 +9,7 @@ from django.core.files.storage import default_storage
 from django.core.files.images import ImageFile
 from django.db.models import signals
 from django.utils.encoding import force_unicode, smart_str
+from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 
 class FieldFile(File):
@@ -176,7 +177,7 @@ class FileDescriptor(object):
         # subclasses might also want to subclass the attribute class]. This
         # object understands how to convert a path to a file, and also how to
         # handle None.
-        if isinstance(file, basestring) or file is None:
+        if isinstance(file, six.string_types) or file is None:
             attr = self.field.attr_class(instance, self.field, file)
             instance.__dict__[self.field.name] = attr