"asyncore" --- Asynchronous socket handler
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バージョン 3.6 で非推奨、バージョン 3.12 で削除.

This module is no longer part of the Python standard library. It was
removed in Python 3.12 after being deprecated in Python 3.6.  The
removal was decided in **PEP 594**.

Applications should use the "asyncio" module instead.

The last version of Python that provided the "asyncore" module was
Python 3.11.
