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How do I write a code which gives me all prime ideals up to a specific norm?

I am new to sage. This program should give me all prime ideals in $\mathcal{O}_K$ with $K=\mathbb{Q}(i)$ up to norm $5$. So far I have :

sage: K.<a> = QuadraticField(-1)
for j in range(5):
L= K.ideals_of_bdd_norm(j)
if L.is_prime():
print L