以下是一个示例代码，实现了按照升序或降序打印多项式中的x或s的幂次。

class Term:
    def __init__(self, coefficient, exponent):
        self.coefficient = coefficient
        self.exponent = exponent

    def __repr__(self):
        return f'{self.coefficient}x^{self.exponent}'


def print_polynomial_terms(terms, sort_order):
    if sort_order == 'asc':
        sorted_terms = sorted(terms, key=lambda term: term.exponent)
    elif sort_order == 'desc':
        sorted_terms = sorted(terms, key=lambda term: term.exponent, reverse=True)
    else:
        raise ValueError('Invalid sort order')

    for term in sorted_terms:
        print(term)


# 示例用法
terms = [Term(2, 3), Term(-1, 1), Term(4, 2)]
print_polynomial_terms(terms, 'asc')
print_polynomial_terms(terms, 'desc')

运行以上代码，将按照升序或降序打印多项式中的幂次。

输出结果：

-1x^1
4x^2
2x^3

2x^3
4x^2
-1x^1