redis/asyncio/connection.py [162:174]:
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        event_dispatcher: Optional[EventDispatcher] = None,
    ):
        if (username or password) and credential_provider is not None:
            raise DataError(
                "'username' and 'password' cannot be passed along with 'credential_"
                "provider'. Please provide only one of the following arguments: \n"
                "1. 'password' and (optional) 'username'\n"
                "2. 'credential_provider'"
            )
        if event_dispatcher is None:
            self._event_dispatcher = EventDispatcher()
        else:
            self._event_dispatcher = event_dispatcher
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redis/connection.py [251:270]:
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        event_dispatcher: Optional[EventDispatcher] = None,
    ):
        """
        Initialize a new Connection.
        To specify a retry policy for specific errors, first set
        `retry_on_error` to a list of the error/s to retry on, then set
        `retry` to a valid `Retry` object.
        To retry on TimeoutError, `retry_on_timeout` can also be set to `True`.
        """
        if (username or password) and credential_provider is not None:
            raise DataError(
                "'username' and 'password' cannot be passed along with 'credential_"
                "provider'. Please provide only one of the following arguments: \n"
                "1. 'password' and (optional) 'username'\n"
                "2. 'credential_provider'"
            )
        if event_dispatcher is None:
            self._event_dispatcher = EventDispatcher()
        else:
            self._event_dispatcher = event_dispatcher
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