How to use the testinfra.backend.paramiko function in testinfra

def client(self):
        client = paramiko.SSHClient()
        client.set_missing_host_key_policy(paramiko.WarningPolicy())
        cfg = {
            "hostname": self.host.name,
            "port": int(self.host.port) if self.host.port else 22,
            "username": self.host.user,
            "timeout": self.timeout,
        }
        if self.ssh_config:
            with open(self.ssh_config) as f:
                ssh_config = paramiko.SSHConfig()
                ssh_config.parse(f)
                self._load_ssh_config(client, cfg, ssh_config)
        else:
            # fallback reading ~/.ssh/config
            default_ssh_config = os.path.join(
                os.path.expanduser('~'), '.ssh', 'config')
            try:

"port": int(self.host.port) if self.host.port else 22,
            "username": self.host.user,
            "timeout": self.timeout,
        }
        if self.ssh_config:
            with open(self.ssh_config) as f:
                ssh_config = paramiko.SSHConfig()
                ssh_config.parse(f)
                self._load_ssh_config(client, cfg, ssh_config)
        else:
            # fallback reading ~/.ssh/config
            default_ssh_config = os.path.join(
                os.path.expanduser('~'), '.ssh', 'config')
            try:
                with open(default_ssh_config) as f:
                    ssh_config = paramiko.SSHConfig()
                    ssh_config.parse(f)
            except IOError:
                pass
            else:
                self._load_ssh_config(client, cfg, ssh_config)

        if self.ssh_identity_file:
            cfg["key_filename"] = self.ssh_identity_file
        client.connect(**cfg)
        return client

elif key == "user":
                cfg["username"] = value
            elif key == "port":
                cfg[key] = int(value)
            elif key == "identityfile":
                cfg["key_filename"] = os.path.expanduser(value[0])
            elif key == "stricthostkeychecking" and value == "no":
                client.set_missing_host_key_policy(IgnorePolicy())
            elif key == "requesttty":
                self.get_pty = value in ('yes', 'force')
            elif key == "gssapikeyexchange":
                cfg['gss_auth'] = (value == 'yes')
            elif key == "gssapiauthentication":
                cfg['gss_kex'] = (value == 'yes')
            elif key == "proxycommand":
                cfg['sock'] = paramiko.ProxyCommand(value)

def client(self):
        client = paramiko.SSHClient()
        client.set_missing_host_key_policy(paramiko.WarningPolicy())
        cfg = {
            "hostname": self.host.name,
            "port": int(self.host.port) if self.host.port else 22,
            "username": self.host.user,
            "timeout": self.timeout,
        }
        if self.ssh_config:
            with open(self.ssh_config) as f:
                ssh_config = paramiko.SSHConfig()
                ssh_config.parse(f)
                self._load_ssh_config(client, cfg, ssh_config)
        else:
            # fallback reading ~/.ssh/config
            default_ssh_config = os.path.join(
                os.path.expanduser('~'), '.ssh', 'config')