Multiple data feeds with duplicate output

Vypy1

I don't know what I am doing wrong, what I want is to be able to use one strategy only multiple datas of different stocks. I referred to this post and to this post.

I tried to write a script similar to it just to make sure that feeds are getting read in as expected. While I do end up getting close prices for both my feeds, I get a duplicate output.

Provided the duplicate output below my code. One date is getting printed twice. How do I address this?

My code:

class maCross(bt.Strategy):

    def __init__(self):
            
#         for n in range(len(self.datas)):
        self.hopen = self.datas[0].open
        self.hclose = self.datas[0].close
        self.mopen = self.datas[1].open
        self.mclose = self.datas[1].close


    def next(self):

#         for i in range(len(self.datas)):
        print(f'Date: {self.datas[0].datetime.date()}, HDFC Close: {self.hclose[0]} Maruti Close: {self.mclose[0]}')
    

cerebro = bt.Cerebro()
datalist = [hdfc, maruti]

for i in range(len(datalist)):
    data = pandas_data_ext(dataname=datalist[i][0], datetime=None, open=-1, high=-1, low=-1, close=-1, volume=-1, Peaks=-1, Trough=-1)
    cerebro.adddata(data)
cerebro.addstrategy(maCross)
cerebro.run()

Output:

Date: 2017-02-10, HDFC Close: 1388.55 Maruti Close: 6112.25
Date: 2017-02-10, HDFC Close: 1388.55 Maruti Close: 6022.0
Date: 2017-02-13, HDFC Close: 1392.05 Maruti Close: 6022.0
Date: 2017-02-13, HDFC Close: 1392.05 Maruti Close: 5939.85
Date: 2017-02-14, HDFC Close: 1398.15 Maruti Close: 5939.85
Date: 2017-02-14, HDFC Close: 1398.15 Maruti Close: 5862.7
Date: 2017-02-15, HDFC Close: 1399.15 Maruti Close: 5862.7
Date: 2017-02-15, HDFC Close: 1399.15 Maruti Close: 6024.55
Date: 2017-02-16, HDFC Close: 1393.55 Maruti Close: 6024.55
Date: 2017-02-16, HDFC Close: 1393.55 Maruti Close: 5989.75
Date: 2017-02-17, HDFC Close: 1402.5 Maruti Close: 5989.75
Date: 2017-02-17, HDFC Close: 1402.5 Maruti Close: 6093.15
Date: 2017-02-20, HDFC Close: 1393.3 Maruti Close: 6093.15
Date: 2017-02-20, HDFC Close: 1393.3 Maruti Close: 6063.15
Date: 2017-02-21, HDFC Close: 1412.45 Maruti Close: 6063.15
Date: 2017-02-21, HDFC Close: 1412.45 Maruti Close: 6079.65
Date: 2017-02-22, HDFC Close: 1394.1 Maruti Close: 6079.65
Date: 2017-02-22, HDFC Close: 1394.1 Maruti Close: 6031.0
Date: 2017-02-23, HDFC Close: 1385.7 Maruti Close: 6031.0
Date: 2017-02-23, HDFC Close: 1385.7 Maruti Close: 5951.5
Date: 2017-02-27, HDFC Close: 1375.7 Maruti Close: 5951.5
Date: 2017-02-27, HDFC Close: 1375.7 Maruti Close: 5922.5
Date: 2017-02-28, HDFC Close: 1370.05 Maruti Close: 5922.5

rajanprabu

@vypy1

By default BT assumes that you have timeframe Day. If its not daily timeframe give timeframe. That may fix your issue.. just a guess with what you posted.

Vypy1

@rajanprabu I noticed the other df was timezone aware, I made it tz naive and that solved the issue and I am not getting duplicate outputs anymore. But out of curiosity, do you know why having a tz aware prints duplicate outputs?