Beginner Blender Python tutorial code for retrieving the script file path when running from Blender's Text Editor, an Add-on, or the Command Line (tutorial video: https://youtu.be/jT2EbqMfKU8)

get_script_folder_path.py

import bpy

import pathlib

# check if we are running from the Text Editor
if bpy.context.space_data != None and bpy.context.space_data.type == "TEXT_EDITOR":
    # get the path to the SAVED TO DISK script when running from blender
    print("bpy.context.space_data script_path")
    script_path = bpy.context.space_data.text.filepath
else:
    print("__file__ script_path")
    # __file__ is built-in Python variable that represents the path to the script
    script_path = __file__

print(f"script_path -> {script_path}")

script_dir = pathlib.Path(script_path).resolve().parent
print(f"[pathlib] script_dir -> {script_dir}")

# get a path to a file that is next to the script
path_to_file = str(script_dir / "my_materials.blend")
print(f"path_to_file -> {path_to_file}")

when I tried to run the command in CMD didn't run. I want to know how to import STL files into Blender using Python scripting.