TypeError:can't use a string pattern on bytes-like object

Python 运行程序提示

import urllib.request
import re

url = 'https://www.douban.com/group/'
data = urllib.request.urlopen(url).read()
r = re.compile(r'https://www\.douban\.com/group/topic/\d+')
c = r.findall(data)
print(c)import urllib.request
import