由小数类组装的列表项的查找索引

Question

I'm trying to find the index of specifyed element in my list that looks like this for example Which is generated by xrange with Fractional.

>> print lst
[Fraction(1, 8), Fraction(1, 7), Fraction(1, 6), Fraction(1, 5), Fraction(1, 4),          Fraction(2, 7), Fraction(1, 3), Fraction(3, 8), Fraction(2, 5), Fraction(3, 7), Fraction(1,   2), Fraction(4, 7), Fraction(3, 5), Fraction(5, 8), Fraction(2, 3), Fraction(5, 7), Fraction(3, 4), Fraction(4, 5), Fraction(5, 6), Fraction(6, 7), Fraction(7, 8)] 

I have been trying everything. Why doesn't this work.

lst.index(1,6) 

or

lst.index( Fraction(1,6) )

and I have tried many more but I always get

print lst.index(Fraction(1,6))
ValueError: Fraction(1, 6) is not in list

Any advice ?

More on how I created the list :

for d in xrange(1,limit+1):
        for n in xrange(1,limit+1):
                x = Fraction(n,d)
                lst.append(x)

Answer 1

seems fine to me...

>>> from fractions import Fraction
>>> d = [Fraction(1, 8), Fraction(1, 7), Fraction(1, 6), Fraction(1, 5), Fraction(1, 4),          Fraction(2, 7), Fraction(1, 3), Fraction(3, 8), Fraction(2, 5) , Fraction(3, 7), Fraction(1,   2), Fraction(4, 7), Fraction(3, 5), Fraction(5, 8), Fraction(2, 3), Fraction(5, 7), Fraction(3, 4), Fraction(4, 5), Fraction(5,6), Fraction(6, 7), Fraction(7, 8)]
>>> d.index(Fraction(1,6))
2