python驗(yàn)證網(wǎng)頁是否存在

import urllib.requestimport timeopener = urllib.request.build_opener()opener.addheaders = [('User-agent', 'Mozilla/49.0.2')]# 這個(gè)是你放網(wǎng)址的文件名，改過來就可以了file = open('test.txt')lines = file.readlines()aa = []for line in lines:    temp = line.replace('', '')    aa.append(temp)print(aa)print('開始檢查