[py3] Replaced basestring by six.string_types.

1 files changed, 2 insertions, 1 deletions

diff --git a/django/core/serializers/pyyaml.py b/django/core/serializers/pyyaml.py
index 73e92d557f..ac0e6cf82d 100644
--- a/django/core/serializers/pyyaml.py
+++ b/django/core/serializers/pyyaml.py
@@ -13,6 +13,7 @@ from django.core.serializers.base import DeserializationError
 from django.core.serializers.python import Serializer as PythonSerializer
 from django.core.serializers.python import Deserializer as PythonDeserializer
 from django.utils.encoding import smart_str
+from django.utils import six
 
 
 class DjangoSafeDumper(yaml.SafeDumper):
@@ -53,7 +54,7 @@ def Deserializer(stream_or_string, **options):
     """
     if isinstance(stream_or_string, bytes):
         stream_or_string = stream_or_string.decode('utf-8')
-    if isinstance(stream_or_string, basestring):
+    if isinstance(stream_or_string, six.string_types):
         stream = StringIO(stream_or_string)
     else:
         stream = stream_or_string