XD-DENG commented on issue #4878: [AIRFLOW-4046] Added validations for 
poke_interval & timeout for Airflow Sensor
URL: https://github.com/apache/airflow/pull/4878#issuecomment-471163723
 
 
   I'm still thinking if we should have `isinstance(poke_interval, 
numbers.Number)` or `isinstance(poke_interval, (int, float))`? Because complex 
numbers are also `numbers.Number`.
   
   ```python
   isinstance(complex(1, 3), numbers.Number)
   # True
   
   complex(1,3) < 0
   # TypeError: '<' not supported between instances of 'complex' and 'int'
   ``` 

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