cannot import name 'warnings' from 'matplotlib.dates'

gregOh

I ran into this import issue and found article below, so I apply the code, but same issue not resolved. any one can help please?

https://community.backtrader.com/topic/981/importerror-cannot-import-name-min_per_hour-when-trying-to-plot/8

The entire source code is posted below(you need to plug in Alpaca keys in order to run)

from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
MONTHS_PER_YEAR, DAYS_PER_WEEK,
SEC_PER_HOUR, SEC_PER_DAY,
num2date, rrulewrapper, YearLocator,
MicrosecondLocator)
import alpaca_backtrader_api
import backtrader as bt
from datetime import datetime
#import matplotlib

ALPACA_API_KEY = "XXXXX"
ALPACA_SECRET_KEY = "XXXX"
ALPACA_PAPER = True

class SmaCross(bt.SignalStrategy):
def init(self):
sma1, sma2 = bt.ind.SMA(period=10), bt.ind.SMA(period=30)
crossover = bt.ind.CrossOver(sma1, sma2)
self.signal_add(bt.SIGNAL_LONG, crossover)

cerebro = bt.Cerebro()
cerebro.addstrategy(SmaCross)

store = alpaca_backtrader_api.AlpacaStore(
key_id=ALPACA_API_KEY,
secret_key=ALPACA_SECRET_KEY,
paper=ALPACA_PAPER
)

if not ALPACA_PAPER:
broker = store.getbroker() # or just alpaca_backtrader_api.AlpacaBroker()
cerebro.setbroker(broker)

DataFactory = store.getdata # or use alpaca_backtrader_api.AlpacaData
data0 = DataFactory(dataname='AAPL', historical=True, fromdate=datetime(
2015, 1, 1), timeframe=bt.TimeFrame.Days)
cerebro.adddata(data0)

print('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())
cerebro.run()
print('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())
cerebro.plot()

sistemaon

I had the same issue... Am using python-3.6.13, conda-4.9.2, backtrader-1.9.76.123.dist-info.

It seems matplotlib version I was using (matplotlib-3.3.4) were the issue, even importing warnings (import warnings) did not resolve.

The solution for me was:
pip uninstall matplotlib
pip install matplotlib==3.2.2

EMR

@gregoh This error was fixed in this file : https://github.com/mementum/backtrader/blob/master/backtrader/plot/locator.py
with PR #418

Before fix :

from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
                              MONTHS_PER_YEAR, DAYS_PER_WEEK,
                              SEC_PER_HOUR, SEC_PER_DAY,
                              num2date, rrulewrapper, YearLocator,
                              MicrosecondLocator, warnings)

After fix :

import warnings
(...)
from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
                              MONTHS_PER_YEAR, DAYS_PER_WEEK,
                              SEC_PER_HOUR, SEC_PER_DAY,
                              num2date, rrulewrapper, YearLocator,
                              MicrosecondLocator)

You can either install backtrader from its github sources or apply @sistemaon solution