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The solution is to use a filename.py file.
For the sage specific syntax, find the corresponding Python code using preparse.
Find the sage specific functions to import using import_statements.
For example, suppose that your sage file has
R.<x> = PolynomialRing(QQ)
which is not correct Python syntax. Check how to turn that into correct Python.
sage: preparse('R.<x> = PolynomialRing(QQ)')
"R = PolynomialRing(QQ, names=('x',)); (x,) = R._first_ngens(1)"
so in filename.py you would write
R = PolynomialRing(QQ, names=('x',))
(x,) = R._first_ngens(1)
instead of
R.<x> = PolynomialRing(QQ)
You would also need the import statements, which you find with
sage: import_statements('PolynomialRing')
from sage.rings.polynomial.polynomial_ring_constructor import PolynomialRing
sage: import_statements('QQ')
...
from sage.rings.rational_field import QQ
So your python file would really have
from sage.rings.polynomial.polynomial_ring_constructor import PolynomialRing
from sage.rings.rational_field import QQ
R = PolynomialRing(QQ, names=('x',))
(x,) = R._first_ngens(1)
