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# 0, 1, 1, 2, 3, 5
def fib(n):
if n < 0:
raise Exception("Need to supply an index that's >= 0. Not: {}".format(n))
elif n in {0, 1}:
return n
state = [0, 1]
for i in range(1, n):
state[0], state[1] = state[1], state[0] + state[1]
return state[-1]
for i in range(10):
print("fib({}) => {}".format(i, fib(i)))
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