UPD: first little 2to3 migration steps.

dav_base/management/commands/enable_module.py

@@ -27,7 +27,7 @@ class Command(BaseCommand):
         if pkg_resources.resource_exists(module_name, input_file):
             output_file = os.path.join(django_base_dir, django_main_module, settings_file_name)
             if not os.path.exists(output_file):
-                with open(output_file, 'w') as f:
+                with open(output_file, 'wb') as f:
                     f.write(pkg_resources.resource_string(module_name, input_file))
 
         module_meta_obj = ModuleMeta(module_name)