Issue #18200: Update the stdlib (except tests) to use
ModuleNotFoundError.
diff --git a/Lib/pty.py b/Lib/pty.py
index e841f12..605aeee 100644
--- a/Lib/pty.py
+++ b/Lib/pty.py
@@ -67,7 +67,7 @@
     result = os.open(tty_name, os.O_RDWR)
     try:
         from fcntl import ioctl, I_PUSH
-    except ImportError:
+    except ModuleNotFoundError:
         return result
     try:
         ioctl(result, I_PUSH, "ptem")