遍历所有纳斯达克股票交易代码，以获取股息收益率

Question

还是python的新手。我从纳斯达克下载了所有股票。

import ftplib
import os
import re
# Connect to ftp.nasdaqtrader.com
ftp = ftplib.FTP('ftp.nasdaqtrader.com', 'anonymous', 'anonymous@debian.org')
# Download files nasdaqlisted.txt and otherlisted.txt from ftp.nasdaqtrader.com
for ficheiro in ["nasdaqlisted.txt", "otherlisted.txt"]:
        ftp.cwd("/SymbolDirectory")
        localfile = open(ficheiro, 'wb')
        ftp.retrbinary('RETR ' + ficheiro, localfile.write)
        localfile.close()
ftp.quit()
# Grep for common stock in nasdaqlisted.txt and otherlisted.txt
for ficheiro in ["nasdaqlisted.txt", "otherlisted.txt"]:
        localfile = open(ficheiro, 'r')
        for line in localfile:
                if re.search("Common Stock", line):
                        ticker = line.split("|")[0]
                        # Append tickers to file tickers.txt
                        open("tickers.txt","a+").write(ticker + "\n")

我想利用这个ticker.txt文件，并在yfinance中循环遍历该文件，以找到可能的股息收益率和市盈率。我得到这个：IndexError：列表索引超出范围。我想解决这个问题。我该如何解决这个问题，并使用纳斯达克的所有股票以及股息收益率和市盈率来创建输出？下面是我的第二个脚本。

import bs4
import requests
from bs4 import BeautifulSoup
import yfinance as yf

dictionary = {}

with open("tickers.txt") as f:
    stocks = f.read().splitlines()

for t in stocks:
    ticker = yf.Ticker(t)
    #dictionary[t] = ticker.info["priceToBook"]
    dictionary[t] = ticker.info["dividendYield"]
    #dictionary[t] = get_pe_ratio(t)
    print(dictionary)
    f = open("DivYield.txt", "w+")
    f.write( (t+1))