Is this what you're looking for?

sage: z = ComplexNumber(1,2)
sage: z
1.00000000000000 + 2.00000000000000*I
sage: print z.str(istr='j')
1.0000000000000000 + 2.0000000000000000*j

I don't think there's a global way to do this in Sage.  I'm also not quite
sure which kind of complex number you're working with; can you provide Sage
commands?
David

On Fri, Apr 12, 2019 at 4:23 AM <nghiap...@moet.edu.vn> wrote:

> Hello everybody,
> Ín sage, how change complex number symbols:
> i^2=-1, z=a+bi
> Now I want
> j^2=-1, z=a+bj
> Thank you!
>
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