add urllib sample

samples/commonlib/use_urllib.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from urllib import request, parse
+
+# get:
+
+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'))
+
+# advanced get:
+
+req = request.Request('http://www.douban.com/')
+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'))
+
+# post:
+
+print('Login to weibo.cn...')
+email = input('Email: ')
+passwd = input('Password: ')
+login_data = parse.urlencode([
+    ('username', email),
+    ('password', passwd),
+    ('entry', 'mweibo'),
+    ('client_id', ''),
+    ('savestate', '1'),
+    ('ec', ''),
+    ('pagerefer', 'https://passport.weibo.cn/signin/welcome?entry=mweibo&r=http%3A%2F%2Fm.weibo.cn%2F%3Fjumpfrom%3Dweibocom&jumpfrom=weibocom')
+])
+
+req = request.Request('https://passport.weibo.cn/sso/login')
+req.add_header('Origin', '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%3Fjumpfrom%3Dweibocom')
+
+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'))
+
+# with proxy and proxy auth:
+
+proxy_handler = urllib.request.ProxyHandler({'http': 'http://www.example.com:3128/'})
+proxy_auth_handler = urllib.request.ProxyBasicAuthHandler()
+proxy_auth_handler.add_password('realm', 'host', 'username', 'password')
+opener = urllib.request.build_opener(proxy_handler, proxy_auth_handler)
+with opener.open('http://www.example.com/login.html') as f:
+    pass