Better checking if the content can be printable in the BrowsableAPI

rest_framework/renderers.py

@@ -325,7 +325,7 @@ class BrowsableAPIRenderer(BaseRenderer):
         renderer_context['indent'] = 4
         content = renderer.render(data, accepted_media_type, renderer_context)
 
-        if not all(char in string.printable for char in content):
+        if not isinstance(content, six.text_type):
             return '[%d bytes of binary content]'
 
         return content