Empty plot in PyCharm

[rajah9]

I am able to resample hourly bars, but my plot remains empty. Using PyCharm, I have tried plot(iplot=True) and plot(iplot=False).

Here's the code:

from __future__ import absolute_import, division, print_function, unicode_literals
import backtrader as bt
import backtrader.stores.ibstore as ibstore
import datetime
import logging
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)

_CLIENTID = 100

class St(bt.Strategy):
    def __init__(self):
        self.sma = bt.indicators.SMA(self.data)

    def logdata(self):
        txt = []
        txt.append('{}'.format(len(self)))
        txt.append('{}'.format(self.data.datetime.datetime(0).isoformat()))
        txt.append('{:.2f}'.format(self.data.open[0]))
        txt.append('{:.2f}'.format(self.data.high[0]))
        txt.append('{:.2f}'.format(self.data.low[0]))
        txt.append('{:.2f}'.format(self.data.close[0]))
        txt.append('{:.2f}'.format(self.data.volume[0]))
        logger.debug(','.join(txt))

    data_live = False

    def notify_data(self, data, status, *args, **kwargs):
        print('*' * 5, 'DATA Notification:', data._getstatusname(status), *args)
        if status == data.LIVE:
            self.data_live = True

    def next(self):
        self.logdata()
        if not self.data_live:
            return

_TICKER = "TSLA-STK-SMART-USD"
_FROMDATE = datetime.datetime(2021,1,4)
_TODATE = datetime.datetime(2021,1,8)
_HAS_STATS = False

def run(args=None):
    cerebro = bt.Cerebro(stdstats=_HAS_STATS)

    store = ibstore.IBStore(host="127.0.0.1", port=7497, clientId= _CLIENTID )
    cerebro.broker = store.getbroker()
    stockkwargs = dict(
        timeframe=bt.TimeFrame.Minutes,
        compression=5,
        rtbar=False,  # use RealTime 5 seconds bars
        historical=True,  # only historical download
        qcheck=0.5,  # timeout in seconds (float) to check for events
        fromdate=_FROMDATE,  # get data from..
        todate=_TODATE,  # get data to..
        latethrough=False,  # let late samples through
        tradename=None  # use a different asset as order target
    )

    data0 = store.getdata(dataname=_TICKER, **stockkwargs)
    cerebro.resampledata(data0, timeframe=bt.TimeFrame.Minutes, compression=60)

    cerebro.addstrategy(St)
    cerebro.run()
    cerebro.plot(iplot=True, stdstats=_HAS_STATS) # Same behavior whether iplot=True or =False

if __name__ == "__main__":
    run()

Here's the console output:

Server Version: 76
TWS Time at connection:20210220 08:41:53 EST
***** DATA Notification: DELAYED
DEBUG:__main__:30,2021-01-05T17:00:00,749.65,754.40,735.11,753.21,6011.00
DEBUG:__main__:31,2021-01-05T18:00:00,753.39,754.18,751.60,753.34,1126.00
DEBUG:__main__:32,2021-01-05T19:00:00,753.32,753.32,750.49,752.90,1179.00
(... deleted ...)
DEBUG:__main__:62,2021-01-07T17:00:00,829.40,834.72,816.04,833.00,5338.00
DEBUG:__main__:63,2021-01-07T18:00:00,832.40,833.01,829.02,830.36,1797.00
DEBUG:__main__:64,2021-01-07T19:00:00,830.59,831.95,828.81,829.50,1086.00
***** DATA Notification: DISCONNECTED
DEBUG:matplotlib:CACHEDIR=C:\Users\Owner\.matplotlib
DEBUG:matplotlib.font_manager:Using fontManager instance from C:\Users\Owner\.matplotlib\fontlist-v330.json
DEBUG:matplotlib.pyplot:Loaded backend TkAgg version unknown.

It displays a Figure popup, but it is always an empty figure, never plots, and has to be closed. I was expecting to show an hourly plot with an SMA line.

[rajah9]

I've read elsewhere (https://stackoverflow.com/a/63974376/509840) that one can back out matplotlib to an earlier version. I did this:

pip uninstall matplotlib  
pip install matplotlib==3.2.2

and it began to plot.