List insert(i, x)
#Insert an item at a given position. The first argument is the index of the element
#before which to insert, so a.insert(0, x) inserts at the front of the list,
#and a.insert(len(a), x) is equivalent to a.append(x).
a = [66.25, 333, 333, 1, 1234.5]
a.insert(2, -1)
print a
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