SMA (simple moving avg) Not receiving Data (stock prices).

[paulyan]

Hi,
See the code below.

import yfinance as yf
 
ticker = "AAPL"
date1 = '2010-01-01'   # start and end date 
date2 = '2020-01-01'    
df=yf.download(ticker,date1, date2)

def SMA(data, period=10):
    return data['Close'].rolling(window=period).mean()
#
df['SMA10']=SMA(df)

df.head(11)
Out[895]: 
                Open      High       Low     Close  Adj Close     Volume  \
Date                                                                       
2010-01-04  7.622500  7.660714  7.585000  7.643214   6.535085  493729600   
2010-01-05  7.664286  7.699643  7.616071  7.656429   6.546385  601904800   
2010-01-06  7.656429  7.686786  7.526786  7.534643   6.442255  552160000   
2010-01-07  7.562500  7.571429  7.466071  7.520714   6.430344  477131200   
2010-01-08  7.510714  7.571429  7.466429  7.570714   6.473095  447610800   
2010-01-11  7.600000  7.607143  7.444643  7.503929   6.415992  462229600   
2010-01-12  7.471071  7.491786  7.372143  7.418571   6.343011  594459600   
2010-01-13  7.423929  7.533214  7.289286  7.523214   6.432483  605892000   
2010-01-14  7.503929  7.516429  7.465000  7.479643   6.395229  432894000   
2010-01-15  7.533214  7.557143  7.352500  7.354643   6.288351  594067600   
2010-01-19  7.440357  7.685357  7.401429  7.680000   6.566539  730007600   

               SMA10  
Date                  
2010-01-04       NaN  
2010-01-05       NaN  
2010-01-06       NaN  
2010-01-07       NaN  
2010-01-08       NaN  
2010-01-11       NaN  
2010-01-12       NaN  
2010-01-13       NaN  
2010-01-14       NaN  
2010-01-15  7.520571  
2010-01-19  7.524250  

np.mean(df.Close[0:10])
Out[900]: 7.520571374893189