从列表格式转换为表示相等的矩阵

def list_to_matrix(equivalence_list):
    elements = list(set([item for sublist in equivalence_list for item in sublist]))
    matrix = [[0] * len(elements) for _ in range(len(elements))]
    
    for equivalence in equivalence_list:
        for i in range(len(equivalence)):
            for j in range(i+1, len(equivalence)):
                element1 = equivalence[i]
                element2 = equivalence[j]
                index1 = elements.index(element1)
                index2 = elements.index(element2)
                matrix[index1][index2] = 1
                matrix[index2][index1] = 1
    
    return matrix