#try表示去打开一个网页，看是否有错误，注意Exception的书写
#觉得例子是爬豆瓣网5次
import re
import urllib.request
for i in range(1,5):
try:
file = urllib.request.urlopen("https://read.douban.com/provider/all",timeout = 0.5)
data = file.read()
print(len(data))
except Exception as e:
print("出现异常："+str(e))