How to use the aiosmtplib.default._default function in aiosmtplib

def _update_settings_from_kwargs(
        self,
        hostname: Optional[Union[str, Default]] = _default,
        port: Optional[Union[int, Default]] = _default,
        username: Optional[Union[str, Default]] = _default,
        password: Optional[Union[str, Default]] = _default,
        source_address: Optional[Union[str, Default]] = _default,
        timeout: Optional[Union[float, Default]] = _default,
        loop: Optional[Union[asyncio.AbstractEventLoop, Default]] = _default,
        use_tls: Optional[bool] = None,
        start_tls: Optional[bool] = None,
        validate_certs: Optional[bool] = None,
        client_cert: Optional[Union[str, Default]] = _default,
        client_key: Optional[Union[str, Default]] = _default,
        tls_context: Optional[Union[ssl.SSLContext, Default]] = _default,
        cert_bundle: Optional[Union[str, Default]] = _default,
        socket_path: Optional[Union[SocketPathType, Default]] = _default,
        sock: Optional[Union[socket.socket, Default]] = _default,
    ) -> None:
        """Update our configuration from the kwargs provided.

        This method can be called multiple times.
        """
        if hostname is not _default:

hostname: Optional[Union[str, Default]] = _default,
        port: Optional[Union[int, Default]] = _default,
        username: Optional[Union[str, Default]] = _default,
        password: Optional[Union[str, Default]] = _default,
        source_address: Optional[Union[str, Default]] = _default,
        timeout: Optional[Union[float, Default]] = _default,
        loop: Optional[Union[asyncio.AbstractEventLoop, Default]] = _default,
        use_tls: Optional[bool] = None,
        start_tls: Optional[bool] = None,
        validate_certs: Optional[bool] = None,
        client_cert: Optional[Union[str, Default]] = _default,
        client_key: Optional[Union[str, Default]] = _default,
        tls_context: Optional[Union[ssl.SSLContext, Default]] = _default,
        cert_bundle: Optional[Union[str, Default]] = _default,
        socket_path: Optional[Union[SocketPathType, Default]] = _default,
        sock: Optional[Union[socket.socket, Default]] = _default,
    ) -> None:
        """Update our configuration from the kwargs provided.

        This method can be called multiple times.
        """
        if hostname is not _default:
            self.hostname = hostname
        if loop is not _default:
            if loop is not None:
                warnings.warn(
                    "Passing an event loop via the loop keyword argument is deprecated."
                    " It will be removed in version 2.0.",
                    DeprecationWarning,
                    stacklevel=3,
                )
            self.loop = loop

async def _send_recipients(
        self,
        recipients: Sequence[str],
        options: Iterable[str],
        encoding: str = "ascii",
        timeout: Optional[Union[float, Default]] = _default,
    ) -> Dict[str, SMTPResponse]:
        """
        Send the recipients given to the server. Used as part of
        :meth:`.sendmail`.
        """
        recipient_errors = []
        for address in recipients:
            try:
                await self.rcpt(
                    address, options=options, encoding=encoding, timeout=timeout
                )
            except SMTPRecipientRefused as exc:
                recipient_errors.append(exc)

        if len(recipient_errors) == len(recipients):
            raise SMTPRecipientsRefused(recipient_errors)

def _update_settings_from_kwargs(
        self,
        hostname: Optional[Union[str, Default]] = _default,
        port: Optional[Union[int, Default]] = _default,
        username: Optional[Union[str, Default]] = _default,
        password: Optional[Union[str, Default]] = _default,
        source_address: Optional[Union[str, Default]] = _default,
        timeout: Optional[Union[float, Default]] = _default,
        loop: Optional[Union[asyncio.AbstractEventLoop, Default]] = _default,
        use_tls: Optional[bool] = None,
        start_tls: Optional[bool] = None,
        validate_certs: Optional[bool] = None,
        client_cert: Optional[Union[str, Default]] = _default,
        client_key: Optional[Union[str, Default]] = _default,
        tls_context: Optional[Union[ssl.SSLContext, Default]] = _default,
        cert_bundle: Optional[Union[str, Default]] = _default,
        socket_path: Optional[Union[SocketPathType, Default]] = _default,
        sock: Optional[Union[socket.socket, Default]] = _default,
    ) -> None:
        """Update our configuration from the kwargs provided.

        This method can be called multiple times.
        """

def _update_settings_from_kwargs(
        self,
        hostname: Optional[Union[str, Default]] = _default,
        port: Optional[Union[int, Default]] = _default,
        username: Optional[Union[str, Default]] = _default,
        password: Optional[Union[str, Default]] = _default,
        source_address: Optional[Union[str, Default]] = _default,
        timeout: Optional[Union[float, Default]] = _default,
        loop: Optional[Union[asyncio.AbstractEventLoop, Default]] = _default,
        use_tls: Optional[bool] = None,
        start_tls: Optional[bool] = None,
        validate_certs: Optional[bool] = None,
        client_cert: Optional[Union[str, Default]] = _default,
        client_key: Optional[Union[str, Default]] = _default,
        tls_context: Optional[Union[ssl.SSLContext, Default]] = _default,
        cert_bundle: Optional[Union[str, Default]] = _default,
        socket_path: Optional[Union[SocketPathType, Default]] = _default,
        sock: Optional[Union[socket.socket, Default]] = _default,
    ) -> None:
        """Update our configuration from the kwargs provided.

        This method can be called multiple times.
        """
        if hostname is not _default:
            self.hostname = hostname

self,
        hostname: Optional[Union[str, Default]] = _default,
        port: Optional[Union[int, Default]] = _default,
        username: Optional[Union[str, Default]] = _default,
        password: Optional[Union[str, Default]] = _default,
        source_address: Optional[Union[str, Default]] = _default,
        timeout: Optional[Union[float, Default]] = _default,
        loop: Optional[Union[asyncio.AbstractEventLoop, Default]] = _default,
        use_tls: Optional[bool] = None,
        start_tls: Optional[bool] = None,
        validate_certs: Optional[bool] = None,
        client_cert: Optional[Union[str, Default]] = _default,
        client_key: Optional[Union[str, Default]] = _default,
        tls_context: Optional[Union[ssl.SSLContext, Default]] = _default,
        cert_bundle: Optional[Union[str, Default]] = _default,
        socket_path: Optional[Union[SocketPathType, Default]] = _default,
        sock: Optional[Union[socket.socket, Default]] = _default,
    ) -> None:
        """Update our configuration from the kwargs provided.

        This method can be called multiple times.
        """
        if hostname is not _default:
            self.hostname = hostname
        if loop is not _default:
            if loop is not None:
                warnings.warn(
                    "Passing an event loop via the loop keyword argument is deprecated."
                    " It will be removed in version 2.0.",
                    DeprecationWarning,
                    stacklevel=3,
                )

async def login(
        self,
        username: str,
        password: str,
        timeout: Optional[Union[float, Default]] = _default,
    ) -> SMTPResponse:
        """
        Tries to login with supported auth methods.

        Some servers advertise authentication methods they don't really
        support, so if authentication fails, we continue until we've tried
        all methods.
        """
        await self._ehlo_or_helo_if_needed()

        if not self.supports_extension("auth"):
            raise SMTPException("SMTP AUTH extension not supported by server.")

        response = None  # type: Optional[SMTPResponse]
        exception = None  # type: Optional[SMTPAuthenticationError]
        for auth_name in self.supported_auth_methods:

def _update_settings_from_kwargs(
        self,
        hostname: Optional[Union[str, Default]] = _default,
        port: Optional[Union[int, Default]] = _default,
        username: Optional[Union[str, Default]] = _default,
        password: Optional[Union[str, Default]] = _default,
        source_address: Optional[Union[str, Default]] = _default,
        timeout: Optional[Union[float, Default]] = _default,
        loop: Optional[Union[asyncio.AbstractEventLoop, Default]] = _default,
        use_tls: Optional[bool] = None,
        start_tls: Optional[bool] = None,
        validate_certs: Optional[bool] = None,
        client_cert: Optional[Union[str, Default]] = _default,
        client_key: Optional[Union[str, Default]] = _default,
        tls_context: Optional[Union[ssl.SSLContext, Default]] = _default,
        cert_bundle: Optional[Union[str, Default]] = _default,
        socket_path: Optional[Union[SocketPathType, Default]] = _default,
        sock: Optional[Union[socket.socket, Default]] = _default,
    ) -> None:
        """Update our configuration from the kwargs provided.

        This method can be called multiple times.
        """
        if hostname is not _default:
            self.hostname = hostname
        if loop is not _default:
            if loop is not None:
                warnings.warn(
                    "Passing an event loop via the loop keyword argument is deprecated."
                    " It will be removed in version 2.0.",