Fraction simplification precoded in Latex

def st(num):
    if num<0:
        return '('+str(num)+')'
    else: return str(num)
from random import*
array=[1,2,3,5,7,11,13,17]

o=[]
ats=[]
while(len(o)<20):
    a=randint(0,16)
    b=randint(0,16)
    print a, b
    i=[-1,-2,-3,-5,-7,-11,-13,-17, 0, 1,2,3,5,7,11,13,17][a]
    j=[-1,-2,-3,-5,-7,-11,-13,-17, 0, 1,2,3,5,7,11,13,17][b]
    k=[1,2,3,5,7,11,13,17][randint(0,7)]
    o.append('\\task $ \\frac{'+str(i*k)+'}{'+str(j*k)+'}'+'$')
    if i==0: ats.append('\\task $0$')
    elif abs(j)==1: ats.append('\\task $'+str(i*j)+'$')
    elif j==0: ats.append('\\task E')
    elif i==0: ats.append('\\task $0$')
    elif i==j: ats.append('\\task $'+ ['-',''][(i*j/abs(i*j)+1)/2]+'1'+'$')
    else: ats.append('\\task $'+ ['-',''][(i*j/abs(i*j)+1)/2]+'\\frac{'+str(abs(i))+'}{'+str(abs(j))+'}'+'$')
print '\\begin{tasks}(3)'
for n in o: print n
print '\\end{tasks}'
print '\\begin{tasks}(5)'
for n in ats: print n
print '\\end{tasks}'