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Summary: in order to load a function from a .sage lib in sage - one has to parse the .sage file first - it will make a .py file - and then import the .py file.

Example:

import os
os.system(os.curdir + os.sep + 'functions.sage')
from functions import states

This way the .sage code got executed in sage - not in python.

How do I import a sage library? Mine is called functions.sage. But when I import - python says it doesn't know it. I tried:

__import__('functions.sage')

and also:

import imp
imp.load_source('fun', 'functions.sage')

None works!