Choice function which returns string created from sequence.

        :param seq: Sequence of letters or digits.
        :type seq: tuple or list
        :param end: Max value.
        :return: Single string.

def schoice(self, seq: str, end: int = 10) -> str:
        """Choice function which returns string created from sequence.

        :param seq: Sequence of letters or digits.
        :type seq: tuple or list
        :param end: Max value.
        :return: Single string.
        """
        return ''.join(self.choice(list(seq))
                       for _ in range(end))