How to create a new blend file / project and run code in it

Question

I would like to know how to execute code in a blend file / project using Python.

Answer 1

Edit

Script now automatically runs in new blend.

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Recap summary of what this script does:

• Creates new blend file.

• Imports stated script.

• Replaces default 3D Viewport window to Text Editor window.

• Assigns imported script to active Text Editor window.

• Automatically runs imported script once Text Editor window is active.

import bpy
bpy.ops.wm.read_homefile(app_template="")
bpy.ops.text.open(filepath=str("D:\Blender\Scripts\external_script.py"))
for window in bpy.context.window_manager.windows: 
    for area in window.screen.areas:
        if area.type == "VIEW_3D":
            area.ui_type = "TEXT_EDITOR"
            area.spaces[0].text = bpy.data.texts["external_script.py"]
            with bpy.context.temp_override(window=window, area=area):
                bpy.ops.text.run_script()
            break