import csv
import yfinance as yf

tickers = ["FB", "NET", "RKLB", "FSLY"]

data = [["ticker", "close"]]

for ticker in tickers:
    stock = yf.Ticker(ticker)
    close_history = stock.history(period="15d")['Close'].tolist()
    data.append([ticker, close_history]) 

f = open('history.csv', 'w')
writer = csv.writer(f)
writer.writerows(data)
f.close()