python - 类型错误 : can't use a string pattern on a bytes-like object in re. findall()

Question

我正在尝试学习如何从页面中自动获取网址。在以下代码中，我试图获取网页的标题:

import urllib.request
import re

url = "http://www.google.com"
regex = r'<title>(,+?)</title>'
pattern  = re.compile(regex)

with urllib.request.urlopen(url) as response:
   html = response.read()

title = re.findall(pattern, html)
print(title)

我收到了这个意外错误:

Traceback (most recent call last):
  File "path\to\file\Crawler.py", line 11, in <module>
    title = re.findall(pattern, html)
  File "C:\Python33\lib\re.py", line 201, in findall
    return _compile(pattern, flags).findall(string)
TypeError: can't use a string pattern on a bytes-like object

我做错了什么？

Answer 1

您想使用 .decode 将 html(类似字节的对象)转换为字符串，例如html = response.read().decode('utf-8')。

见 Convert bytes to a Python String