python使用pycurl处理rpc返回值

出现 TypeError: string argument expected, got 'bytes' 解决方案

在使用StringIO的write方法上，用BytesIO替代StringIO即可解决

b.getvalue
默认返回值的前面,有一个'b'代表的是bytes类型
以下方法过滤了'b'

import pycurl  
import json  
from io import * 
def _curlPost(api,method,params):
        logging.debug(method)
        logging.debug(params)
        url = 'localhost:8443/'+api
        # params = {"foo":"hello ", "bar":"world"};
        data = json.dumps({"jsonrpc": "2.0", "method": method,"params":params, "id": 1})
        
        body = BytesIO() #StringIO()
        curl = pycurl.Curl()
        curl.setopt(pycurl.URL, url)
        curl.setopt(pycurl.WRITEFUNCTION, body.write)
        curl.setopt(pycurl.HTTPHEADER, ['Content-Type: application/json']);
        curl.setopt(pycurl.POST, 1)
        curl.setopt(pycurl.POSTFIELDS, data)
        curl.perform()
        html = body.getvalue()
        print(body)
        print ("HTTP-code:", curl.getinfo(curl.HTTP_CODE))
        body.close()
        curl.close()
        temp = None
        if html==None:
            print('yes')
        else:
            print('no')
            temp=html.decode()
            print(temp)
        return temp

调用例子

ret = _curlPost("users","get_mlisturl",userJson)
print (ret)