missing attribute in handler shutdown

Bug report

Bug description:

My code uses the logging handler package (https://docs.python.org/3/library/logging.handlers.html). On closing, I was getting

Exception ignored in atexit callback <function shutdown at 0x0000017934F72770>:
Traceback (most recent call last):
File "...._init_.py", line 2244, in shutdown
if getattr(h, 'flushOnClose', True):
RuntimeError: wrapped C/C++ object of type QTextEditLogger has been deleted

'QTextEditLogger' being a child class of Handler:

class QTextEditLogger(Handler, QObject):
    appendPlainText = pyqtSignal(str)

    def __init__(self, parent):
        Handler.__init__(self) 
        QObject.__init__(self)
        ....

when the program closed.
I finally traced the problem back to the shutdown() function in the getLogger class.

       if h:
           try:
              h.acquire()
              # MemoryHandlers might not want to be flushed on close,
              # but circular imports prevent us scoping this to just
              # those handlers.  hence the default to True.
              if getattr(h, 'flushOnClose', True):
                  h.flush()
              h.close()

Not all handlers have the 'flushOnClose' attribute! So it throws an exception, as per the documentation, BTW, when getattr() is called and 'flushOnClose' isn't there.

The fix is simple, I added the hasattr() function to see if the attribute exists:

       **if hasattr(h, 'flushOnClose'):**                     
             if getattr(h, 'flushOnClose', True):
                h.flush()
        h.close()

CPython versions tested on:

3.14

Operating systems tested on:

Windows

レポートに示されているshutdown()コード付近の__init__.pyから始め、CPython 3.14でのQTextEditLoggerの例におけるハンドラーのクリーンアップ動作を調べます。Windowsのシャットダウン時のトレースバックを再現し、修正後のクリーンアップ経路で報告された例外が発生しなくなることを確認します。同時に、通常のハンドラーのフラッシュとクローズは維持します。