Андрей Казанцев <hec...@yandex.ru> added the comment: How to make singleton class? I wrote this
``` import asyncio class Singleton: _CREATE_LOCK = asyncio.Lock() @classmethod async def create(cls): if not hasattr(cls, '_Singleton__instance'): async with cls._CREATE_LOCK: if not hasattr(cls, '_Singleton__instance'): await asyncio.sleep(1) cls.__instance = cls() return cls.__instance async def main(): await asyncio.wait([ Singleton.create(), Singleton.create(), ]) if __name__ == '__main__': asyncio.run(main()) ``` and got `RuntimeError` ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39483> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com