Simplify exception message retrieval logic

Author: Locked-chess-official

Lib/idlelib/run.py

@@ -229,12 +229,7 @@ def show_socket_error(err, address):
 
 def get_message_lines(typ, exc, tb):
     "Return line composing the exception message."
-    if typ in (AttributeError, NameError):
-        # 3.10+ hints are not directly accessible from python (#44026).
-        traceback_exception = traceback.TracebackException(typ, exc, tb)
-        return list(traceback_exception.format_exception_only())
-    else:
-        return traceback.format_exception_only(typ, exc)
+    return list(traceback.TracebackException(typ, exc, tb).format_exception_only())
 
 
 def print_exception():