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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def binormal_curve_single(obj, u, normalize):
 """ Evaluates the curve binormal vector at the given u parameter. Curve binormal is the cross product of the normal and the tangent vectors. The output returns a list containing the starting point (i.e. origin) of the vector and the vector itself. :param obj: input curve :type obj: abstract.Curve :param u: parameter :type u: float :param normalize: if True, the returned vector is converted to a unit vector :type normalize: bool :return: a list containing "point" and "vector" pairs :rtype: tuple """

    # Cross product of tangent and normal vectors gives binormal vector
    tan_vector = tangent_curve_single(obj, u, normalize)
    norm_vector = normal_curve_single(obj, u, normalize)

    point = tan_vector[0]
    vector = linalg.vector_cross(tan_vector[1], norm_vector[1])
    vector = linalg.vector_normalize(vector) if normalize else vector

    return tuple(point), tuple(vector)