value of cerebro.broker.getvalue() never changed

STEVEN 0

Hi All,

I'm following the quickguide. I've already feed my data, and my code can print buy log. however, value of cerebro.broker.getvalue() has never changed. Anyone knows why?

Here is the result:
it can show buy/create,but cerebro.broker.getvalue() is still 100000.

Starting Portfolio Value: 100000.00
2022-07-15, Close, 32.31
2022-07-14, Close, 32.82
2022-07-13, Close, 30.56
2022-07-12, Close, 29.44
2022-07-12, BUY CREATE, 29.44
2022-07-11, Close, 31.43
2022-07-08, Close, 31.90
……
2018-12-07, BUY CREATE, 25.75
2018-12-06, Close, 26.16
2018-12-05, Close, 25.91
2018-12-04, Close, 25.47
2018-12-04, BUY CREATE, 25.47
2018-12-03, Close, 25.63
Final Portfolio Value: 100000.00

Here is my code:

from __future__ import (absolute_import, division, print_function,
                        unicode_literals)

import datetime  # For datetime objects
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 Stratey
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):
        # Keep a reference to the "close" line in the data[0] dataseries
        self.dataclose = self.datas[0].close

    def next(self):
        # Simply log the closing price of the series from the reference
        self.log('Close, %.2f' % self.dataclose[0])

        if self.dataclose[0] < self.dataclose[-1]:
            # current close less than previous close

            if self.dataclose[-1] < self.dataclose[-2]:
                # previous close less than the previous close

                # BUY, BUY, BUY!!! (with all possible default parameters)
                self.log('BUY CREATE, %.2f' % self.dataclose[0])
                self.buy()


if __name__ == '__main__':
    # Create a cerebro entity
    cerebro = bt.Cerebro()

    # Add a strategy
    cerebro.addstrategy(TestStrategy)

    # Datas are in a subfolder of the samples. Need to find where the script is
    # because it could have been called from anywhere
    modpath = os.path.dirname(os.path.abspath(sys.argv[0]))
    datapath = os.path.join(modpath, 'D:/300568_TTL.csv')

    # Create a Data Feed
    data = bt.feeds.GenericCSVData(
        dataname=datapath,
        datetime=2,
        open=3,
        high=4,
        low=5,
        close=6,
        volume=10,
        K_value=12,
        J_value=14,
        dtformat=('%Y%m%d'),
        # Do not pass values before this date
        fromdate=datetime.datetime(2018, 12, 1),
        # Do not pass values before this date
        todate=datetime.datetime(2022, 7, 16),
        # Do not pass values after this date
        reverse=True)

    # Add the Data Feed to Cerebro
    cerebro.adddata(data)

    # Set our desired cash start
    cerebro.broker.setcash(100000.0)

    # Print out the starting conditions
    print('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())

    # Run over everything
    cerebro.run()

    # Print out the final result
    print('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())![alt text](![image url](image url))