Issue #12718: Set importer on instance if Python function, to avoid bad interaction with winpdb.
diff --git a/Misc/NEWS b/Misc/NEWS
index cd2b2fc..016f5d7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -247,6 +247,9 @@
 Library
 -------
 
+- Issue #12718: Fix interaction with winpdb overriding __import__ by setting
+  importer attribute on BaseConfigurator instance.
+  
 - Issue #17521: Corrected non-enabling of logger following two calls to
   fileConfig().