Import these dependencies and set the variables

imports.py

# Imports
from pandas_datareader import data as pdr
from pandas import ExcelWriter
import yfinance as yf
import pandas as pd
import datetime
import time
import requests
yf.pdr_override()

# Get tickers for all S&P 500 stocks from Wikipedia
def tickers_sp500():
    url = 'https://en.wikipedia.org/wiki/List_of_S%26P_500_companies'
    html = requests.get(url).text
    df = pd.read_html(html, header=0)[0]
    tickers = df['Symbol'].tolist()
    return tickers

# Variables
tickers = tickers_sp500()
tickers = [item.replace(".", "-") for item in tickers] # Yahoo Finance uses dashes instead of dots
index_name = '^GSPC' # S&P 500
start_date = datetime.datetime.now() - datetime.timedelta(days=365)
end_date = datetime.date.today()
exportList = pd.DataFrame(columns=['Stock', "RS_Rating", "50 Day MA", "150 Day Ma", "200 Day MA", "52 Week Low", "52 week High"])
returns_multiples = []