Python爬虫学习（二）

实例一：使用Python下载图片

import urllib.request

response = urllib.request.urlopen('http://placekitten.com/g/500/600')
cat_img = response.read()

with open('cat_500_600.jpg', 'wb') as f:
    f.write(cat_img)

实例二：使用有道词典自动翻译

# http://bbs.fishc.com/thread-86581-1-1.html
import urllib.request
import urllib.parse
import json

content = input('请输入需要翻译的内容：')

url = 'http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule&sessionFrom='
data = {}
data['i'] = content
data['from'] = 'AUTO'
data['to'] = 'AUTO'
data['smartresult'] = 'dict'
data['client'] = 'fanyideskweb'
data['salt'] = '1510557149618' #时间戳
data['sign'] = '81be643e4248fd97469f341c4b722605' #加密算法
data['doctype'] = 'json'
data['version'] = '2.1'
data['keyfrom'] = 'fanyi.web'
data['action'] = 'FY_BY_CLICKBUTTION'
data['typoResult'] = 'true'

data = urllib.parse.urlencode(data).encode('utf-8')

response = urllib.request.urlopen(url, data)
html = response.read().decode('utf-8')

target = json.loads(html)
print('翻译结果：%s' % (target['translateResult'][0][0]['tgt']))