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My base field is GF(2^3) and to construct the field i am using irreducible polynomial p(x)=x^3+x+1. the extension field is GF(2^3)^2 and i want to construct this field using irreducible polynomial p(z)= z^2+(a^2+a+1)*z+a^2 where (a^2+a+1 and a^2 are the elements of field GF(2^3)) where a is represent theta that is root of irreducible polynomial over GF(2^3) . i have written the code in sage but it gives me error .

K.=GF(2^3);K.modulus() for i in enumerate(K): print i K1. = GF(K,'modulus=x^2+(a^2+a+1)*x+a^2');K1.modulus()

My base field is GF(2^3) and to construct the field i am using irreducible polynomial p(x)=x^3+x+1. the extension field is GF(2^3)^2 and i want to construct this field using irreducible polynomial p(z)= z^2+(a^2+a+1)*z+a^2 where (a^2+a+1 and a^2 are the elements of field GF(2^3)) where a is represent theta that is root of irreducible polynomial over GF(2^3) . i have written the code in sage but it gives me error .

K.<a>=GF(2^3);K.modulus()
for i in enumerate(K):  print i 
K1. K1.<b> = GF(K,'modulus=x^2+(a^2+a+1)*x+a^2');K1.modulus()      
GF(K,'modulus=x^2+(a^2+a+1)*x+a^2');K1.modulus()