On 3/21/11 2:12 PM, kcrisman wrote:
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.
You've hit on the primary reason why I prefer % formatting to the new
format function when dealing with Latex!
Notice the following:
def f(p=(13,[q for q in prime_range(200) if q%4==1])):
z="$\text{ mod }$".format(p)
f(1)
gives
Traceback (click to the left of this block for traceback)
...
KeyError: ' mod '
That's because of the braces around "mod", which the format function
takes as a substitution string. Instead, double these braces:
@interact
def _(p=(13,[q for q in prime_range(200) if q%4==1])):
k=mod(factorial((p-1)/2),p)
html(r"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))
(note that I also added the r in front of the string so that \t is not
interpreted as a tab.)
That is indeed a weird error, though. I would have expected interact to
print out the error that the format function raised.
Thanks,
Jason
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