Try this:
@interact
def _(p=(13,[q for q in prime_range(200) if q%4==1])):
k=mod(factorial((p-1)/2),p)
html("And we can compute that ${0}^2\equiv{1}$ and ${2}^2\equiv
{3}\text{ mod }({4})$".format(k,k^2,-k,(-k)^2,p))
I have seen successful use of this new Python string formatting in
Sage code, so I know it works. But the results of this are wacky.
Even more fun is trying to use this with $\frac{{0}-1}{2}$, where {0}
refers to an argument but {2} refers to 2 in the denominator. Yikes!
I've found workarounds for my specific needs, but I think it would be
nice for someone knowledgeable about Python strings to determine what
part of this needs a ticket.
- kcrisman
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