post rpc请求，python2使用urllib2可以，python3 用urllib或者requests...

#! python2
#!usr/bin/python
# -*- coding: utf-8 -*-
import urllib2
import json
post_url = 'http://localhost:13300'
postData  = {"jsonrpc": "2.0","method":"accounts", "params":[], "id":1}
data = json.dumps(postData)
req = urllib2.Request(post_url)
resp**e = urllib2.urlopen(req,data)
print (resp**e.read())
####以上代码用python2可以正常使用

python3 用urllib  或者requests 都会报错。