Bpy.ops.transform.rotate, option 'axis'

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I was able to come up with a function to generate a 3x3 matrix from the vector you would plug into the older axis option from 2.79’s transform.rotate. You then enter the matrix this function returns into 2.80’s orient_matrix option and set the orient_axis equal to 'Z' in the updated transform.rotate syntax and it should work the same as it did in 2.79. My function below is based off of this function in Animation Nodes.

from math import isclose
from mathutils import Matrix, Vector

def create_z_orient(rot_vec):
    x_dir_p = Vector(( 1.0,  0.0,  0.0))
    y_dir_p = Vector(( 0.0,  1.0,  0.0))
    z_dir_p = Vector(( 0.0,  0.0,  1.0))
    tol = 0.001
    rx, ry, rz = rot_vec
    if isclose(rx, 0.0, abs_tol=tol) and isclose(ry, 0.0, abs_tol=tol):
        if isclose(rz, 0.0, abs_tol=tol) or isclose(rz, 1.0, abs_tol=tol):
            return Matrix((x_dir_p, y_dir_p, z_dir_p))  # 3x3 identity
    new_z = rot_vec.copy()  # rot_vec already normalized
    new_y = new_z.cross(z_dir_p)
    new_y_eq_0_0_0 = True
    for v in new_y:
        if not isclose(v, 0.0, abs_tol=tol):
            new_y_eq_0_0_0 = False
            break
    if new_y_eq_0_0_0:
        new_y = y_dir_p
    new_x = new_y.cross(new_z)
    new_x.normalize()
    new_y.normalize()
    return Matrix(((new_x.x, new_y.x, new_z.x),
                   (new_x.y, new_y.y, new_z.y),
                   (new_x.z, new_y.z, new_z.z)))
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