The first step in using stock data for financial analysis is to download price data from yahoo Finance. Below is a very simple example for downloading data.

import yfinance as yf
import pandas as pd
startDay="2020-06-18"
endDay="2020-06-20"

fnlist='nasdqIntheUSAMostActiveStocks.txt' #symbols
fns=pd.read_csv(fnlist)
toPath='NASDQ/'

for fn0 in fns.Symbols:
    stockName=fn0.replace(' ','')
    toFile=toPath+stockName+'.csv'
    toFile=toFile.replace(' ','')
    data = yf.download(stockName, start=startDay, end=endDay)
    data.to_csv(toFile)