The Blender Python API can't create Blender data that exists outside the main Blender database (accessed through :mod:`bpy.data`), because this data is managed by Blender (save, load, undo, append, ...

Blender add-ons are written in Python, and Python has a huge and rich library of packages available (namely https://pypi.org). However, there is no obvious way to make use of these packages from a ...