问BeautifulSoup HTTP错误403:禁止-不确定原因

EN

import os 
import re
from bs4 import BeautifulSoup
#import urllib.request
#from urllib.request import request, urlopen
from urllib import request
import pandas as pd
import numpy as np
import datetime
import time
import openpyxl


for a in range(0,len(symbols),1):
    """
        Attempt to get past the Forbidden error message.
    """
    #ua = UserAgent()
    url = "https://fintel.io/ss/us/" + symbols[a]
    """
       test urls:
                 https://fintel.io/ss/us/A
                 https://fintel.io/ss/us/BBY'
                 https://fintel.io/ss/us/WMT'
    """

    print("Extracting Values for " + symbols[a] + ".")
    header = {
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36'
        }
    try:
            page_request = request.Request(url, headers=header)
            page = request.urlopen(page_request)
            #old page = urllib.request.urlopen(url)
            soup = BeautifulSoup(page, "html.parser", from_encoding="iso-8859-1")

Extracting Values for A.
HTTP Error 403: Forbidden
Extracting Values for BBY.
HTTP Error 403: Forbidden
Extracting Values for WMT.
HTTP Error 403: Forbidden