python2与python3爬虫中get与post对比

1. python2中的urllib2改为python3中的urllib.request

2. 四种方式对比：

python2的get：

# coding=utf-8
import urllib
import urllib2

word = urllib.urlencode({"wd":"百度"})
url = 'http://www.baidu.com/s' + '?' + word
request = urllib2.Request(url)
print urllib2.urlopen(request).read().decode('utf-8')

python3的get

import urllib.request
import urllib.parse

data = urllib.parse.urlencode({'wd':'百度'})
url  = 'http://wwww.baidu.com/s?' + data
# url = 'http://www.baidu.com/s?wd=' + urllib.parse.quote('百度')
response = urllib.request.urlopen(url)
print (response.read().decode('utf-8'))

python2的post

# coding=utf-8
import urllib
import urllib2

formdata = {
    'name':'百度'
}
data = urllib.urlencode(formdata)
request = urllib2.Request(url = "http://httpbin.org/post", data=data)
response = urllib2.urlopen(request)
print response.read()

python3的post

import urllib.parse
import urllib.request

data = bytes(urllib.parse.urlencode({'name':'百度'}),encoding='utf8')
response = urllib.request.urlopen('http://httpbin.org/post',data=data)
print(response.read().decode('utf-8'))

或

import urllib.parse
import urllib.request

request = urllib.request.Request('http://httpbin.org/post',data=bytes(urllib.parse.urlencode({'name':'百度'}),encoding='utf8))'))
response = urllib.request.urlopen(request)
print (response.read().decode('utf-8'))