Python 3.3类型错误:不能在一个字节类的对象上使用字符串模式。

I am trying to learn how to automatically fetch urls from a page. In the following code I am trying to get the title of the webpage:

我正在尝试学习如何从一个页面自动获取url。在下面的代码中，我试图获得网页的标题:

import urllib.request
import re

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

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

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

And I get this unexpected error:

我得到了一个意想不到的错误:

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

What am I doing wrong?

我做错了什么?

Thanks!

谢谢!

1 个解决方案

#1

You want to convert html (a byte-like object) into a string using .decode, e.g. html = response.read().decode('utf-8').

要将html(类似字节的对象)转换成字符串，使用.decode，例如html = response.read().decode('utf-8')。

See Convert bytes to a Python String

参见将字节转换为Python字符串。

#1