import yfinance as yf
aapl = yf.download('AAPL', '2017-1-1','2019-12-18')
aapl['Adj Open'] = aapl.Open * aapl['Adj Close']/aapl['Close']
aapl['Adj High'] = aapl.High * aapl['Adj Close']/aapl['Close']
aapl['Adj Low'] = aapl.Low * aapl['Adj Close']/aapl['Close']
aapl.dropna(inplace=True)
from ta.trend import ADXIndicator
adxI = ADXIndicator(aapl['Adj High'],aapl['Adj Low'],aapl['Adj Close'],14,False)
aapl['pos_directional_indicator'] = adxI.adx_pos()
aapl['neg_directional_indicator'] = adxI.adx_neg()
aapl['adx'] = adxI.adx()
aapl.tail()