A blender script to flip import an obj with borked UVs!

blender_obj_to_blend_flipped_v.py

# invoke like blender --background --python belnder_obj_to_blend_flipped_v.py -- input.obj output.blend

import bpy
import sys
 
argv = sys.argv
argv = argv[argv.index("--") + 1:] # get all args after "--"
 
obj_out = argv[0]

# Delete all existing meshes
for obj in list(bpy.data.objects):
    if obj.type == "CAMERA": continue
    obj.select = True
    bpy.ops.object.delete()

# Drop a lamp at (0, -5, 5)
lamp_data = bpy.data.lamps.new(name="Face Lamp", type='POINT')
lamp_object = bpy.data.objects.new(name="Face Lamp", object_data=lamp_data)
bpy.context.scene.objects.link(lamp_object)
lamp_object.location = (0, -5, 5)

bpy.ops.import_scene.obj(filepath=obj_out, axis_forward='-Z', axis_up='Y', split_mode="OFF")

# Flip our y axis on all our UVs
for obj in list(bpy.data.objects):
    if obj.type != "MESH": continue

    for layer in obj.data.uv_layers:
       for loop in layer.data.values():
           loop.uv[1] *= -1

bpy.ops.file.pack_all()

bpy.ops.wm.save_as_mainfile(filepath=argv[1])