Trying to understand method

[Giri234]

I am trying to understand the following code in home assisant integration. Is setup_platform method is ending on where it is returning None or everything until add_entties method. Any pointers would help me too. Thanks.

def setup_platform(
    hass: HomeAssistant,
    config: ConfigType,
    add_entities: AddEntitiesCallback,
    discovery_info: DiscoveryInfoType | None = None,
) -> None:
    """Connect to Sony projector using network."""

    host = config[CONF_HOST]
    name = config[CONF_NAME]
    sdcp_connection = pysdcp.Projector(host)

    # Sanity check the connection
    try:
        sdcp_connection.get_power()
    except ConnectionError:
        _LOGGER.error("Failed to connect to projector '%s'", host)
        return
    _LOGGER.debug("Validated projector '%s' OK", host)
    add_entities([SonyProjector(sdcp_connection, name)], True)

deanhystad write Oct-04-2024, 02:07 AM:
Please post all code, output and errors (it it's entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.

[deanhystad]

It depends. If there is a ConnectionError calling sdcp_connection.get_power(), an error is logged and the function returns. If there is not a ConnectionError the function logs the debug message and calls add_entities. Read about python exception handling here:

https://docs.python.org/3/tutorial/errors.html