Python用lxml下载图片答案

【问题标题】：Python download image with lxmlPython用lxml下载图片
【发布时间】：2012-07-18 23:27:27
【问题描述】：

我需要在类似于这个的 HTML 代码中找到一张图片：

...
<a href="/example/1"> 
    <img id="img" src="http://example.net/example.jpg" alt="Example" />
</a>
...

我正在使用 lxml 和请求。

代码如下：

import lxml
from lxml import html
import requests

url = 'http://www.example.com'

r = requests.get(url)
tree = lxml.html.fromstring(r.content)

img = tree.get_element_by_id("img")
f = open("image.jpg",'wb')
f.write(requests.get(img['src']).content)

但我得到一个错误：

Traceback (most recent call last):
  File "/Users/Name/Documents/Python/Example/Script.py", line 13, in <module>
    s = requests.get(img['src'])
  File "/Library/Python/2.6/site-packages/lxml/lxml.etree.pyx", line 1052, in lxml.etree._Element.__getitem__ (src/lxml/lxml.etree.c:38272)
TypeError: 'str' object cannot be interpreted as an index

建议？

【问题讨论】：

建议：阅读文档并修复html。

标签： python web-scraping python-requests lxml

【解决方案1】：

import lxml.html
import requests

url = 'http://www.example.com/'
tree = lxml.html.parse(url)
img = tree.get_element_by_id('img')
img_url = img.attrib['src']

with open('image.jpg', 'wb') as outf:
    data = requests.get(img_url).content
    outf.write(data)

【讨论】：

img = tree.get_element_by_id('img') 这次不行，它说： Traceback (last recent call last): File "/Users/Example/Documents/Python/Example/ Script.py"，第 6 行，在 img = tree.get_element_by_id('img') AttributeError: 'lxml.etree._ElementTree' object has no attribute 'get_element_by_id' 我试图替换 tree = lxml.html.parse( url) 与 tree = lxml.html.fromstring(requests.get(url).content) 现在它可以工作了，感谢帮助！

【解决方案2】：

试试f.write(requests.get(img.attrib['src']).content)

【讨论】：