How to use the josepy.ComparableRSAKey function in josepy

def load_rsa_private_key(*names):
    """Load RSA private key."""
    loader = _guess_loader(names[-1], serialization.load_pem_private_key,
                           serialization.load_der_private_key)
    return jose.ComparableRSAKey(loader(
        load_vector(*names), password=None, backend=default_backend()))

"--register-unsafely-without-email was not present.")
            logger.warning(msg)
            raise errors.Error(msg)
        if not config.dry_run:
            logger.info("Registering without email!")

    # If --dry-run is used, and there is no staging account, create one with no email.
    if config.dry_run:
        config.email = None

    # Each new registration shall use a fresh new key
    rsa_key = generate_private_key(
            public_exponent=65537,
            key_size=config.rsa_key_size,
            backend=default_backend())
    key = jose.JWKRSA(key=jose.ComparableRSAKey(rsa_key))
    acme = acme_from_config_key(config, key)
    # TODO: add phone?
    regr = perform_registration(acme, config, tos_cb)

    acc = account.Account(regr, key)
    account.report_new_account(config)
    account_storage.save(acc, acme)

    eff.handle_subscription(config)

    return acc, acme

"--register-unsafely-without-email was not present.")
            logger.warning(msg)
            raise errors.Error(msg)
        if not config.dry_run:
            logger.info("Registering without email!")

    # If --dry-run is used, and there is no staging account, create one with no email.
    if config.dry_run:
        config.email = None

    # Each new registration shall use a fresh new key
    rsa_key = generate_private_key(
            public_exponent=65537,
            key_size=config.rsa_key_size,
            backend=default_backend())
    key = jose.JWKRSA(key=jose.ComparableRSAKey(rsa_key))
    acme = acme_from_config_key(config, key)
    # TODO: add phone?
    regr = perform_registration(acme, config, tos_cb)

    acc = account.Account(regr, key)
    account.report_new_account(config)
    account_storage.save(acc, acme)

    eff.handle_subscription(config)

    return acc, acme

key = rsa.generate_private_key(
                public_exponent=65537,
                key_size=ACCOUNT_KEY_SIZE,
                backend=default_backend(),
            )

            # Store it to file
            pem = key.private_bytes(
                encoding=serialization.Encoding.PEM,
                format=serialization.PrivateFormat.PKCS8,
                encryption_algorithm=serialization.NoEncryption(),
            )
            self.path_account_key.write_bytes(pem)
            self.path_account_key.chmod(0o600)

        self._account_jwk = jose.JWKRSA(key=jose.ComparableRSAKey(key))