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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_channelstate_settling( chain_state: ChainState, payment_network_id: PaymentNetworkID, token_address: TokenAddress, ) -> List[NettingChannelState]: """Return the state of settling channels in a token network."""

    return get_channelstate_filter(
        chain_state,
        payment_network_id,
        token_address,
        lambda channel_state: channel.get_status(channel_state) == CHANNEL_STATE_SETTLING,
    )