Issue #18200: Back out usage of ModuleNotFoundError (8d28d44f3a9a)
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 79e6df2..137ebcb 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -9,7 +9,7 @@
 # Import _thread instead of threading to reduce startup cost
 try:
     from _thread import allocate_lock as Lock
-except ModuleNotFoundError:
+except ImportError:
     from _dummy_thread import allocate_lock as Lock
 
 import io
@@ -1486,7 +1486,7 @@
             if encoding is None:
                 try:
                     import locale
-                except ModuleNotFoundError:
+                except ImportError:
                     # Importing locale may fail if Python is being built
                     encoding = "ascii"
                 else: