doublesidedHelloWorld.py

import bpy
from mathutils import *
from math import pi # wasn't necessary on my mac, but my coworker threw an error without it ¯\_(ツ)_/¯

bpy.ops.object.text_add()
textObject = bpy.context.active_object # the object just addded to the scene becomes the active object of the context
textObject.data.body = "hello\nworld!"
bpy.ops.object.origin_set(type="ORIGIN_GEOMETRY") # set the origin (center of rotation) of the shape to it's geometric center

textObject.rotation_euler[0] = pi / 2 #rotation euler is an array-like, [x,y,z], so this is 90 deg x axis rotation in radians!
textObject.keyframe_insert('rotation_euler',frame = 0) #as opposed to rotation quaternion
textObject.rotation_euler[2] = 20 * pi # 2pi is 360 degrees, 20pi is 10 rotations. 
textObject.keyframe_insert('rotation_euler',frame = 500) # default keyframe interpolation is a sine wave, rotation speeds up and slows down over 500 frames

bpy.ops.object.duplicate_move() #creates an unlinked copy, complete with animation keyframes
bpy.context.active_object.scale[2] = -1 #invert the y axis, effectively flipping the normals to backside of text, otherwise light rays only bounce off one side, and the backside is invisible.

bpy.data.scenes['Scene'].frame_end = 500 #set the length of the animation
bpy.ops.export_scene.fbx(filepath="./holobang.fbx",
                         object_types={'OTHER'}, # for MESH we would use MESH, but Text is a Curve is an Other
                         bake_anim_use_nla_strips=False, 
                         bake_anim_use_all_actions=False) # following recommendations from SketchFab https://help.sketchfab.com/hc/en-us/articles/206223646