Error in loop with python -

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i have list lst = [1, 2, 3, 4, 5, 6, 3, 5, 3] , every iteration, elem == 3 want print strings before that, while elem not 3 again. want 

2 3: 0 1 1 2 6 3: 3 4 4 5 5 6 8 3: 7 5

but don't know, how go previous string

for i, el in enumerate(lst):     if lst[i] == 3:         print i, el         -= 1

but it's inly elem-1

something this?

    lst = [1, 2, 3, 4, 5, 6, 3, 5, 3]     previous = []      i, el in enumerate(lst):         if lst[i] == 3:             print i, el,":"             p in previous:                 print p[0] , p[1]             previous = []         else:             previous.append((i,el))

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