potiuk commented on pull request #20687: URL: https://github.com/apache/airflow/pull/20687#issuecomment-1005842177
```
for base in cls.__bases__:
if not (base in (object, Generic) or
base.__module__ == 'collections.abc' and
base.__name__ in _PROTO_WHITELIST or
isinstance(base, _ProtocolMeta) and base._is_protocol):
raise TypeError('Protocols can only inherit from other'
> ' protocols, got %r' % base)
E TypeError: Protocols can only inherit from other protocols,
got <class 'airf
```
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