Blender World Space to Render Pixel Space

worldSpace_to_RenderSpace.py

# from https://blender.stackexchange.com/questions/882/how-to-find-image-coordinates-of-the-rendered-vertex
#  ===================
# |(0,0)              |
# |                   |
# |                   |
# |                   |
# |              (x,y)|
#  ===================

import bpy
import bpy_extras

D = bpy.data
C = bpy.context

scene = C.scene
cam = C.scene.camera
# Change to your own object or use a handler to track an object
co = D.objects["Cube"].matrix_world.translation

co_2d = bpy_extras.object_utils.world_to_camera_view(scene, cam, co)

# If you want pixel coords
render_scale = scene.render.resolution_percentage / 100
render_size = (
        int(scene.render.resolution_x * render_scale),
        int(scene.render.resolution_y * render_scale),
        )

pixelCoords = (
      round(co_2d.x * render_size[0]),
      round( render_size[1] - co_2d.y * render_size[1]),
      )
        
print("Pixel Coords:", pixelCoords)