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sparse matrix multiplication in python

def sparse_matrix_multiplication(matrix_a, matrix_b):
    if len(matrix_a[0]) != len(matrix_b):
        return [[]]

    matrix_c = [[0] * len(matrix_b[0]) for _ in range(len(matrix_a))]

    for i in range(len(matrix_c)):
        for j in range(len(matrix_c[0])):
            for k in range(len(matrix_b)):
                if matrix_a[i][k] == 0 or matrix_b[k][j] == 0:
                    continue

                matrix_c[i][j] += matrix_a[i][k] * matrix_b[k][j]

    return matrix_c

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sparse matrix multiplication in python

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