Transparent.py

import bpy
bl_info = {
    "name": "Toggle Film Transparent",
    "author": "Xorro",
    "blender": (2, 80, 0),
    "version": (1, 1),
    "category": "Render",
}

def transp_PT(self, context):
    layout = self.layout
    world = context.scene.render

    row = layout.row()
    row.prop(world, "film_transparent", text="Tranparent")


def register():
    bpy.types.EEVEE_WORLD_PT_surface.append(transp_PT)
    bpy.types.CYCLES_WORLD_PT_surface.append(transp_PT)


def unregister():
    bpy.types.EEVEE_WORLD_PT_surface.remove(transp_PT)
    bpy.types.CYCLES_WORLD_PT_surface.remove(transp_PT)


if __name__ == "__main__":
    register()