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import generators as g

@g.started
def remember_two():
    a,b=None,None
    while 1:
        a = yield b,a
        b = yield a,b

data=[
    [6],
    [2,3],
    [8,6,2]
]

for row in data:
    print(repr(row))

window_of_two=remember_two()
for row in data:
    lower, upper = window_of_two.send(row)
    print('==================')
    print('upper', upper)
    print('lower', lower)
    if upper!=None:
        tmp=[]
        for i in g.chain(g.map(zip(upper, g.window(lower,2)), (lambda i:(i[0],i[1][0])), (lambda i:(i[0],i[1][1])))):
            print(i, sum(i))
            tmp.append(sum(i))
        print('tmp', tmp)