Андрей Казанцев <[email protected]> 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`
----------
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<https://bugs.python.org/issue39483>
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