3. AttributeError: 'float' object has no attribute 'isoformat'
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AttributeError: 'float' object has no attribute 'isoformat'


  • I got this error when running below code. How to fix it ? Thank you

    File "C:/Users/PC/PycharmProjects/trading/scr/test.py", line 22, in next
self.log('Close, %.2f', self.dataclose[0])
File "C:/Users/PC/PycharmProjects/trading/scr/test.py", line 16, in log
print('%s, %s' % (dt.isoformat(), txt)) 
AttributeError: 'float' object has no attribute 'isoformat' 

    from __future__ import (absolute_import, division, print_function,
                        unicode_literals)
from datetime import datetime
import os.path  # To manage paths
import sys  # To find out the script name (in argv[0])

# Import the backtrader platform
import backtrader as bt

#Create a Strategy
class TestStrategy(bt.Strategy):
    def log(self, txt, dt=None):
        ''' Logging function fot this strategy'''
        dt = dt or self.datas[0].datetime.date(0)
        print('%s, %s' % (dt.isoformat(), txt))

    def __init__(self):
        self.dataclose = self.datas[0].close

    def next(self):
        self.log('Close, %.2f', self.dataclose[0])


if __name__ == '__main__':
    cerebro = bt.Cerebro()

    cerebro.addstrategy(TestStrategy)

    data = bt.feeds.YahooFinanceData(
        dataname='AAPL',
        fromdate=datetime(2017, 8, 8),
        todate=datetime(2017, 10, 10),
        buffered=True
    )

    cerebro.adddata(data)

    cerebro.broker.setcash(10000)
    print('Starting Portfolio Value: {}'.format(cerebro.broker.getvalue()))
    cerebro.run()
    print('Final value: {}'.format(cerebro.broker.getvalue()))
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     1 Reply

  • Can you run the code with different data source?
    Yahoo data is really unstable now, I will not be surprised that it can cause an error.

    1
  • P

    @Nguyễn-Tài-Nguyên said in AttributeError: 'float' object has no attribute 'isoformat':

        def next(self):
        self.log('Close, %.2f', self.dataclose[0])

    You pass a float and you get a float error. Fix it by not passing a float. You probably wanted to do this

    def next(self):
    self.log('Close, %.2f' % self.dataclose[0])
    1

  • Thank you @ab_trader and @Paska-Houso for replying me :)
    @Paska-Houso ,Yes, that is my wrong. I fixed it and it worked

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