SessionFiller and Resampler together

[momentum]

Hi,

I am trying to combine SessionFiller and Resampler but it does not seem to work no matter which order these are added. Independently both work correctly.

The data set (just showing close) is

,close
2018-08-08 09:01:01,4
2018-08-08 09:02:01,5
2018-08-08 09:03:01,6
2018-08-08 09:06:01,7
2018-08-08 09:07:01,8
2018-08-08 09:08:01,9
2018-08-08 09:09:01,10
2018-08-08 09:10:01,11
2018-08-08 09:11:01,12
2018-08-08 09:12:01,13

and I would expect to get something like

2018-08-08 09:02:00, 4.0
2018-08-08 09:04:00, 6.0
2018-08-08 09:06:00, 6.0
2018-08-08 09:08:00, 8.0
2018-08-08 09:10:00, 10.0
2018-08-08 09:12:00, 12.0
2018-08-08 09:14:00, 13.0

Thanks

import backtrader as bt
import sys
import os
import datetime

class StrategyBidAsk(bt.Strategy):

    def start(self):
        self.counter = 0

    def next(self):
        self.counter += 1
        output_str = ""
        for i in range(len(self.datas)):
            output_str += "{}: {}, {}|".format(self.datas[i]._name, self.datas[i].datetime.datetime(0), self.datas[i].lines.close[0])
        output_str = output_str[:-1]
        print(output_str)

def main(argv):

    folder = "data"
    file = 'Toy_Ask_new.csv'
    cash = 100000.0

    cerebro = bt.Cerebro()
    cerebro.broker.setcash(cash)
    cerebro.broker.set_shortcash(False)
    cerebro.broker.setcommission(commission=0)
    cerebro.broker.set_coc(False)

    data = bt.feeds.GenericCSVData(
            dataname=os.path.join(folder, file),
            dtformat='%Y-%m-%d %H:%M:%S', # default
            datetime=0,         # default
            time=-1,            # default
            close=1,
            high=2,
            low=3,
            open=4,
            volume=5,           # default
            openinterest=-1,    # default for not present
            sessionstart=datetime.time(9, 0),
            sessionend=datetime.time(16, 0),
            timeframe=bt.TimeFrame.Minutes,
            compression=1)      # default

    data.addfilter(bt.filters.SessionFilter)
    data.addfilter(bt.filters.SessionFiller)
    data.addfilter(bt.ResamplerMinutes, compression=2)
    cerebro.adddata(data, name=os.path.splitext(file)[0])

    idx = cerebro.addstrategy(StrategyBidAsk)
    cerebro.addsizer_byidx(idx, bt.sizers.SizerFix, stake=100)
    cerebro.run(runonce=False, preload=True)


if __name__ == "__main__":
    main(sys.argv)

[backtrader]

You have to fill the original data feed.