python：爬虫1——实战（下载一张图片、用Python模拟浏览器，通过在线的有道词典来对文本翻译）

import urllib.request

response = urllib.request.urlopen("http://cdn.duitang.com/uploads/item/201111/24/20111124222137_wHYwc.jpg")
cat_img = response.read()

with open(‘cat_0.jpeg‘, ‘wb‘) as f:
    f.write(cat_img)

import urllib.request

req = urllib.request.Request("http://cdn.duitang.com/uploads/item/201111/24/20111124222137_wHYwc.jpg")
response = urllib.request.urlopen(req)
cat_img = response.read()

with open(‘cat_0.jpeg‘, ‘wb‘) as f:
    f.write(cat_img)

import urllib.request
import urllib.parse
import json

url = ‘http://fanyi.youdao.com/translate_o?smartresult=dict&smartresult=rule&sessionFrom=http://fanyi.youdao.com/‘

data = {
‘i‘:‘china‘,
‘from‘:‘AUTO‘,
‘to‘:‘AUTO‘,
‘smartresult‘:‘dict‘,
‘sign‘:‘cf928c9af5dc3731276ad09db002e052‘,
‘client‘:‘fanyideskweb‘,
‘salt‘:‘1494249290636‘,
‘doctype‘:‘json‘,
‘version‘:‘2.1‘,
‘keyfrom‘:‘fanyi.web‘,
‘action‘:‘FY_BY_CLICKBUTTON‘,
‘typoResult‘:‘true‘
}

data = urllib.parse.urlencode(data).encode(‘utf8‘)
response = urllib.request.urlopen(url, data)
html = response.read().decode(‘utf-8‘)

print(html)　　　　#发现是json格式

target = json.loads(html)

print(target)　　　#打印还原的json