Create / Export scene whitout Blender

Hi !

This is my first post here and I’m very glad to be part of this community.
I am currently interested in scripting with Python for blender. I already succeed in create a Python script with the text editor on Blender.
But now, I read some stuff about controlling Blender without the software but with an IDE.
Actually, I want to run a Python program with Spyder for example which import the Blender libraries and create my scene with different mesh and export in .3ds for example, or better, in .igs, the format for Indigo. All of this, without open Blender, just in running my .py program.
Is that possible ? How can I do that ?
If it is possible, can you give me piece of codes such as the libraries to import and the way to export directly with python without use Blender with File -> Export as… or a link with the information I search ?

Thank you a lot !