Cerebo.plot() Error in plotting resampled data

dusk

I would love to backtest my strategy at a 4-hour timeframe. Therefore, I tried resampling it from minute to 4hour with bt.TimeFrame.Minutes, compression = 240. However, when I run cerebro.plot with this, it showed typeerror (which never showed up when I simply adddata(data)

#CODE
cerebro = bt.Cerebro()
data = pd.read_csv("some.csv",
                   index_col="datetime",
                   parse_dates=True)
data = bt.feeds.PandasData(dataname=data,
                           fromdate=datetime(2020,10,1),
                           todate=datetime(2020,12,31))
cerebro.resampledata(data, bt.TimeFrame.Minutes, compression=240)
cerebro.broker.setcash(100000)
cerebro.broker.setcommission(0.001)
cerebro.run()
cerebro.plot()

#ERROR
Traceback (most recent call last):
  File "/Users/steven/Documents/Projects/Quantitative Trading/Backtesting.py", line 21, in <module>
    cerebro.plot()
  File "/Users/steven/Documents/Projects/Quantitative Trading/venv/lib/python3.7/site-packages/backtrader/cerebro.py", line 991, in plot
    start=start, end=end, use=use)
  File "/x/venv/lib/python3.7/site-packages/backtrader/plot/plot.py", line 220, in plot
    self.plotdata(data, self.dplotsover[data])
  File "/x/venv/lib/python3.7/site-packages/backtrader/plot/plot.py", line 661, in plotdata
    datalabel += data._name
TypeError: can only concatenate str (not "int") to str

I have tried to find where does the int come from but failed. Would love some input for this, thanks!

vladisld

@dusk you may try to supply the name argument to the resampledata method call:

cerebro.resampledata(data, bt.TimeFrame.Minutes, compression=240, name='kuku')

will it work?

dusk

@vladisld seems not as well
it showed multiple value passed for the argument "name", which i guess it is from dataname = data from bt.feeds.PandasData(), and name="kuku".

Traceback (most recent call last):
  File "x/Backtesting.py", line 28, in <module>
    name="kuku")
TypeError: resampledata() got multiple values for argument 'name'

vladisld

@dusk seems strange. Could you please show your code?

dusk

@vladisld Sure! The error occurs regardless of my strategy. Didn't add any strategy below.

import backtrader as bt
import pandas as pd
from datetime import datetime

cerebro = bt.Cerebro()
data = pd.read_csv("Cryptofeed/BTCUSDT_d.csv",
                   index_col="datetime",
                   parse_dates=True)
data = bt.feeds.PandasData(dataname=data,
                           fromdate=datetime(2020,10,1),
                           todate=datetime(2020,12,31))
cerebro.resampledata(data,bt.TimeFrame.Minutes,compression=240,name="kuku")
cerebro.broker.setcash(100000)
cerebro.broker.setcommission(0.001)
print(f"Starting Portfolio Value: {cerebro.broker.getvalue()}")
cerebro.run()
print(f"Ending Portfolio Value: {cerebro.broker.getvalue()}")
cerebro.plot()

Error Message:

Traceback (most recent call last):
  File "/x/Backtesting.py", line 25, in <module>
    cerebro.resampledata(data,bt.TimeFrame.Minutes,compression=240,name="kuku")
TypeError: resampledata() got multiple values for argument 'name'

Thanks a lot!

P.S If i delete the name="kuku" part, error message will become

Traceback (most recent call last):
  File "/x/Backtesting.py", line 33, in <module>
    cerebro.plot()
  File "/x/venv/lib/python3.7/site-packages/backtrader/cerebro.py", line 991, in plot
    start=start, end=end, use=use)
  File "/x/venv/lib/python3.7/site-packages/backtrader/plot/plot.py", line 220, in plot
    self.plotdata(data, self.dplotsover[data])
  File "/x/venv/lib/python3.7/site-packages/backtrader/plot/plot.py", line 661, in plotdata
    datalabel += data._name
TypeError: can only concatenate str (not "int") to str

vladisld

@dusk the second parameter to the resampledata should be 'name' and not 'timeframe'. The 'timeframe' should be provided as a named argument only.