Python--054论一只爬虫的自我修养2：实战

游戏小虾米

Tip：


一，理论



二，应用
1 下载一只猫

import urllib.request

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

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

2
>>> response.geturl()
'http://placekitten.com/g/500/600'
>>> response.info()
<http.client.HTTPMessage object at 0x02F39350>

>>> print(response.info())
Date: Tue, 08 Aug 2017 03:11:23 GMT
Content-Type: image/jpeg
Content-Length: 26590
Connection: close
Set-Cookie: __cfduid=d5ee3088fc458f6434872dc702cdf51f81502161882; expires=Wed, 08-Aug-18 03:11:22 GMT; path=/; domain=.placekitten.com; HttpOnly
Accept-Ranges: bytes
X-Powered-By: PleskLin
Access-Control-Allow-Origin: *
Cache-Control: public
Expires: Thu, 31 Dec 2020 20:00:00 GMT
Server: cloudflare-nginx
CF-RAY: 38af49b7715a329b-HKG

>>> response.getcode()            #获得状态  200 OK
200                  

2 有道词典

import urllib.request
import urllib.parse
import json

content = input('请输入要翻译的内容： ')

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'] = '1502162456644'
data['sign'] = '4799f56048fcfc3308d676668a3afd56'
data['doctype'] = 'json'
data['version'] = '2.1'
data['keyfrom'] = 'fanyi.web'
data['action'] = 'FY_BY_CLlCKBUTTON'
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']))

三，课后练习

angry

这里面下载猫的图片是需要把网页打开吗