def get_unused_address(self) -> Optional[str]:
        """Get an unused receiving address, if there is one.
        Note: there might NOT be one available!
        """
        addrs = self.get_unused_addresses()
        if addrs:
            return addrs[0]
Get an unused receiving address, if there is one.
        Note: there might NOT be one available!
        
electrum/wallet.py