urllib使用四--urlencode,urlparse,

urllib.urlencode

把字典数据转换为URL编码

# -*- coding: cp936 -*-
import urllib

params = {'score':100,'name':'爬虫基础','comment':'very good'}
qs = urllib.urlencode(params)
print(qs)

编码后跟在URL后面传递参数：

comment=very+good&score=100&name=%C5%C0%B3%E6%BB%F9%B4%A1

逆向

在urlparse包里

urlparse.parse_qs方法--返回字典

import urllib
import urlparse

params = {'score':100,'name':'爬虫基础','comment':'very good'}
qs = urllib.urlencode(params)
dic = urlparse.parse_qs(qs)
print(dic)

运行结果：

{'comment': ['very good'], 'score': [''], 'name': ['\xc5\xc0\xb3\xe6\xbb\xf9\xb4\xa1']}

对某个url提取参数：

# -*- coding: cp936 -*-
import urllib
import urlparse
url = 'https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd=python%20%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6&rsv_pq=8ddee8730003c015&rsv_t=fc02P4%2By%2FPKzaFFtaqGCGLCxPvpVojkM6zg7pgczZB%2FeZAQkXhsuWRPpHqs&rqlang=cn&rsv_enter=1&rsv_sug3=14&rsv_sug1=10&rsv_sug7=101'

result = urlparse.urlparse(url)

print(result)

先用urlparse.urlparse(url)方法获取result

ParseResult(scheme='https', netloc='www.baidu.com', path='/s', params='', query='ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd=python%20%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6&rsv_pq=8ddee8730003c015&rsv_t=fc02P4%2By%2FPKzaFFtaqGCGLCxPvpVojkM6zg7pgczZB%2FeZAQkXhsuWRPpHqs&rqlang=cn&rsv_enter=1&rsv_sug3=14&rsv_sug1=10&rsv_sug7=101', fragment='')

对result中的query参数中提取

import urllib
import urlparse
url = 'https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd=python%20%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6&rsv_pq=8ddee8730003c015&rsv_t=fc02P4%2By%2FPKzaFFtaqGCGLCxPvpVojkM6zg7pgczZB%2FeZAQkXhsuWRPpHqs&rqlang=cn&rsv_enter=1&rsv_sug3=14&rsv_sug1=10&rsv_sug7=101'

result = urlparse.urlparse(url)
dic = urlparse.parse_qs(result.query)
print(dic)

运行结果：

{'wd': ['python \xe5\x8f\x91\xe9\x80\x81\xe9\x82\xae\xe4\xbb\xb6'], 'f': [''], 'rsv_enter': [''], 'rsv_bp': [''], 'rsv_t': ['fc02P4+y/PKzaFFtaqGCGLCxPvpVojkM6zg7pgczZB/eZAQkXhsuWRPpHqs'], 'rsv_idx': [''], 'tn': ['baidu'], 'rqlang': ['cn'], 'rsv_sug7': [''], 'rsv_pq': ['8ddee8730003c015'], 'rsv_sug1': [''], 'rsv_sug3': [''], 'ie': ['utf-8']}