How to import sage library to my python program?

edit

If you run the program with sage's python (i.e., sage -python myprogram.py), then you can do this:

from sage.all import *

at the top and then use Sage as normal in the program.

Only importing part of Sage is not supported, as many parts of Sage depend on other parts. So import the whole thing in one go.

I think you might be able to also do:

import sage.all

and then use Sage features by prepending things with sage.all.<whatever_sage_function>, like sage.all.factorial()