title: ImportError Cannot import name 'warnings' from 'matplotlib.dates
body: <p>Alpaca backtrader plot issue: I ran into this import issue and found <a href="https://community.backtrader.com/topic/981/importerror-cannot-import-name-min_per_hour-when-trying-to-plot/8" rel="noreferrer">this article</a>, so I applied the code, but same issue not resolved. any one can help please?</p>
  <p>My installed matplotlib version is 3.3.1
  backtrader 1.9.76.123
  python 3.8.5</p>
  <p>the entire code posted below:</p>
  <pre><code>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 = &quot;XXXXX&quot;
  
  ALPACA_SECRET_KEY = &quot;XXXX&quot;
  
  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()
  </code></pre>