Ticket #8607: yaml-serialization-to-file.diff

django/core/serializers/pyyaml.py

@@ -36 +36 @@
         yaml.safe_dump(self.objects, self.stream, **self.options)
 
     def getvalue(self):
-        return self.stream.getvalue()
+        if callable(getattr(self.stream, 'getvalue', None)):
+            return self.stream.getvalue()
 
 def Deserializer(stream_or_string, **options):
     """