Issue #18200: Update the stdlib (except tests) to use
ModuleNotFoundError.
diff --git a/Lib/rlcompleter.py b/Lib/rlcompleter.py
index d3a4437..4de0c88 100644
--- a/Lib/rlcompleter.py
+++ b/Lib/rlcompleter.py
@@ -154,7 +154,7 @@
 
 try:
     import readline
-except ImportError:
+except ModuleNotFoundError:
     pass
 else:
     readline.set_completer(Completer().complete)