Export keys

        :param keys: Single key ID or list of mutiple IDs. If None export all of the keys.
        :param secret: Export secret keys
        :param passphrase: Secret key password, you need this if secret=true
        :param binary: If false, create ASCII armored output
        :rtype: ExportResult

def export_keys(self, keys=None, secret=False, passphrase=None, binary=False):
        '''
        Export keys

        :param keys: Single key ID or list of mutiple IDs. If None export all of the keys.
        :param secret: Export secret keys
        :param passphrase: Secret key password, you need this if secret=true
        :param binary: If false, create ASCII armored output
        :rtype: ExportResult
        '''
        args = [] if binary else ['--armor']
        if secret:
            args += ('--batch', '--export-secret-keys')
        else:
            args.append('--export')
        if keys:
            args += make_list(keys)
        return self.execute(ExportResult(), args, passphrase or '' if secret else None)