gistfile1.txt

def fibo(n = 10):
    els = []
    prev = 1
    next = 1
    for i in range(n):
        (prev, next) = (next, prev+next)
        els.append(prev)
    return els


def stutter(g, a, b):
    memory = []
    for i in range(b + 1):
        try:
            memory.append(g.next())
        except:
            pass
    print "MEMORY", memory
    cursor = 0
    b = len(memory) - 1
    len_memory = len(memory)
    while b>=a:
        for l in range(a, b + 1):
            # if len < len_memory:
            print l
            yield memory[cursor], memory[(cursor + l)%len(memory)]
        try:
            memory[cursor] = g.next()
        except:
            b -= 1
        cursor = (cursor + 1) % len(memory)


FIBO = fibo()
print FIBO

for el in stutter(iter(FIBO), 1, 2):
    print el