{unixtime: value, unixtime: value, ...etc}

{'1315488736': 0.17000000000000001, '1315488734': 0.17999999999999999, '1315488740': 0.14999999999999999, '1315488738': 0.17000000000000001}

{
    "data": [
        {"label":"1 min = ........", "data":[[1, 1], [2, 2], [3, 3], [4, 2], [5, 1], [6, 1], [7, 1],  [8, 1], [9, 2], [10, 3], [11, 2], [12, 1], [13, 1], [14, 1]]},
        {"label":"5 min = ........", "data":[[1, 1], [2, 1], [3, 2], [4, 1], [5, 1], [6, 1], [7, 1],  [8, 1], [9, 1], [10, 2], [11, 3], [12, 2], [13, 1], [14, 1]]}
    ],
    "ticks": {
        "from": 1315414833147,
        "to": 1315416933147
    }
}

data":[[unixtime, value]
"from": first unixtime
"to": last unixtime

import time
import pprint
from datetime import datetime, timedelta

test_in = {'1315488736': 0.17000000000000001,
           '1315488734': 0.17999999999999999,
           '1315488740': 0.14999999999999999,
           '1315488738': 0.17000000000000001}


def preprocess(input):

    def get_time_slice(tup, period):
        ts_start = tup[0][0]
        ts_end = ts_start + period
        slice = filter(lambda a: a[0] < ts_end, tup)
        return map(lambda a: [time.mktime(a[0].timetuple()), a[1]], slice)

    tup = list()
    ksorted = sorted(input.keys())

    ts_min = min(ksorted)
    ts_max = max(ksorted)

    for k in ksorted:
        dt = datetime.fromtimestamp(float(k))
        tup.append((dt, input[k]))

    res = dict()

    tmp = list()
    for slice in (1, 5):
        key = '%d_min' % slice
        val = get_time_slice(tup, timedelta(minutes=slice))
        tmp.append({key: val})
    res['data'] = tmp
    res['ticks'] = {'from': ts_min, 'to': ts_max}
    return res

pprint.pprint(preprocess(test_in))