urllib.request基本使用

代碼示例：

# # -*- coding: utf-8 -*-ur
from urllib import request, parse

# with request.urlopen('https://api.douban.com/v2/book/2129650') as f:
#     data = f.read()
#     print('Status:', f.status, f.reason)
#     for k, v in f.getheaders():
#         print('%s: %s' % (k, v))
#     print('Data:', data.decode('utf-8'))

# req = request.Request('http://www.douban.com/') #使用Request對象添加頭信息
# req.add_header('User-Agent', 'Mozilla/6.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/8.0 Mobile/10A5376e Safari/8536.25')
# with request.urlopen(req) as f:
#     print('Status:', f.status, f.reason)
#     for k, v in f.getheaders():
#         print('%s: %s' % (k, v))
#     print('Data:', f.read().decode('utf-8'))

print('Login to weibo.cn...')
email = input('Email:')
passwd = input('Password:')
login_data = parse.urlencode([
    ('username', email),
    ('password', passwd),
    ('client_id', ''),
    ('savestate', '1'),
    ('ec', ''),
    ('pagerefer', 'https://passport.weibo.cn/signin/welcome?entry=mweibo&r=http%3A%2F%2Fm.weibo.cn%2F')
])

headers = {
    'Orign': 'https://passport.weibo.cn',
    'User-Agent': 'Mozilla/6.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/8.0 Mobile/10A5376e Safari/8536.25',
    'Referer': 'https://passport.weibo.cn/signin/login?entry=mweibo&res=wel&wm=3349&r=http%3A%2F%2Fm.weibo.cn%2F'
}

req = request.Request('https://passport.weibo.cn/sso/login', headers=headers)
# req.add_header('Orign', 'https://passport.weibo.cn')
# req.add_header('User-Agent',
#                'Mozilla/6.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/8.0 Mobile/10A5376e Safari/8536.25')
# req.add_header('Referer',
#                'https://passport.weibo.cn/signin/login?entry=mweibo&res=wel&wm=3349&r=http%3A%2F%2Fm.weibo.cn%2F')

with request.urlopen(req, data=login_data.encode('utf-8')) as f:
    print("Status:", f.status, f.reason)
    for k, v in f.getheaders():
        print('%s:%s' % (k, v))
    print('Data:', f.read().decode('utf-8'))

要點概括：

1、引入類庫文件

from urllib import request

2、訪問鏈接get

res = request.urlopen(url)

3、返回
內容：data = res.read()
狀態：status = res.status
原因：reason = res.reason

3、增加頭信息：使用Request對象

req = request.Request(url, headers=headers)

其中，頭數組封裝如下：

headers = {
    'Orign': 'https://passport.weibo.cn',
    'User-Agent': 'Mozilla/6.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/8.0 Mobile/10A5376e Safari/8536.25',
    'Referer': 'https://passport.weibo.cn/signin/login?entry=mweibo&res=wel&wm=3349&r=http%3A%2F%2Fm.weibo.cn%2F'
}

4、模擬post請求
封裝post數據

login_data = parse.urlencode([
    ('username', email),
    ('password', passwd),
    ('client_id', ''),
    ('savestate', '1'),
    ('ec', ''),
    ('pagerefer', 'https://passport.weibo.cn/signin/welcome?entry=mweibo&r=http%3A%2F%2Fm.weibo.cn%2F')
])

生成Request對象，添加頭信息：

req = request.Request('https://passport.weibo.cn/sso/login', headers=headers)

發送post請求：

request.urlopen(req, data=login_data.encode('utf-8'))

對返回結果處理。