How to use the jrnl.EncryptedJournal.EncryptedJournal.from_journal function in jrnl

def encrypt(journal, filename=None):
    """ Encrypt into new file. If filename is not set, we encrypt the journal file itself. """
    journal.config['encrypt'] = True

    new_journal = EncryptedJournal.from_journal(journal)
    new_journal.write(filename)

    print("Journal encrypted to {}.".format(filename or new_journal.config['journal']), file=sys.stderr)

cont = util.yesno("\nContinue upgrading jrnl?", default=False)
        if not cont:
            raise KeyboardInterrupt
    except KeyboardInterrupt:
        raise UserAbort("jrnl NOT upgraded, exiting.")

    for journal_name, path in encrypted_journals.items():
        print(
            f"\nUpgrading encrypted '{journal_name}' journal stored in {path}...",
            file=sys.stderr,
        )
        backup(path, binary=True)
        old_journal = Journal.open_journal(
            journal_name, util.scope_config(config, journal_name), legacy=True
        )
        all_journals.append(EncryptedJournal.from_journal(old_journal))

    for journal_name, path in plain_journals.items():
        print(
            f"\nUpgrading plain text '{journal_name}' journal stored in {path}...",
            file=sys.stderr,
        )
        backup(path)
        old_journal = Journal.open_journal(
            journal_name, util.scope_config(config, journal_name), legacy=True
        )
        all_journals.append(Journal.PlainJournal.from_journal(old_journal))

    # loop through lists to validate
    failed_journals = [j for j in all_journals if not j.validate_parsing()]

    if len(failed_journals) > 0: