Pythonのダウンロードのイメージ

Question

は、私はこの1つに似たHTMLコード内の画像を見つける必要があります。ここで

はコードです：

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) 

しかし、私はエラーになっています：

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 

提案を？ドキュメントを読んで、HTMLを修正してください。

Answer 1

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

Answer 2

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)