[PyMOL] how to use pymol functionalities from a python script ?

[VlaDar]

Is it possible to use PyMOL from a Python script without lunching a GUI. 
When I do :
"import cmd from pymol" in a Python program it automatically lunch 
Pymol. The only solution I've found was to write a Python script and to 
execute it from PyMOL with “-c” option. (pymol -c my_script.py)

Thank you for your help.