If i type in the following R.<z1,z2>=PolynomialRing(GF(5),2,"z") direclty to sgae it accepts it as a polynomial ring But if i place this in a .py file and load it from this sage eg sage my.py it gives me a syntax error I guess i need a module loaded for it to be detected, but which module and hance which command do i need to make sage accept this ring