[GitHub] [airflow] ecerulm commented on issue #15325: Custom XCom backends circular import when using cli command like airflow connections list

[GitBox <gi...@apache.org>]

ecerulm commented on issue #15325:
URL: https://github.com/apache/airflow/issues/15325#issuecomment-817869309


   If airflow was Python 3.7+ instead of Python 3.6+ we could change `airflow/models/xcom.py` so that instead of resolving the XCom backend right away it would be delayed until first use. 
   
   So instead of: 
   ```
   XCom = resolve_xcom_backend()
   ``` 
   
   ```
   def __getattr__(name):
     if name == "XCom":
       xcom = resolve_xcom_backend()
       sys.module[__name__].XCom = xcom
       return xcom
     raise AttributeError(f"module {__name__} has no attribute {name}")
   ```
   
   I'm going to try to use  
   ```
   XCom = lazy_object_proxy.Proxy(resolve_xcom_backend)
   ```
   if it works I'll create a PR
   


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