python – TypeError：不是JSON可序列化的

我正在尝试通过“httplib.HTTPSConnection”连接到这个网站“ android-review.googlesource.com”,这实际上是Gerrit(用于审查代码的工具),Gerrit API提供了 JSON格式的审阅数据的接口.我需要收集JSON数据.您可以在此处找到有关Gerrit的更多信息： https://gerritreview.googlesource.com/Documentation/rest-api.html

让我解释一下源代码.有一个名为“GetRequestOrCached”的函数将数据保存在文件中以供缓存使用,另一个函数“MakeRequest”创建与网站的连接并返回响应.但是错误与json.dumps用于请求(req)的部分有关,该请求是字典.

这是错误：

TypeError: <built-in function id> is not JSON serializable

这是代码：

import socket,sys
import httplib
import pyodbc
import json
import types
import datetime
import urllib2
import os
import logging
import re,time

def GetRequestOrCached( url,method,data,filename):

  path = os.path.join("json",filename)
  if not os.path.exists(path):
    data = MakeRequest(url,data)
    time.sleep(1)
    data = data.replace(")]}'","")
    f = open(path,"w")
    f.write(data)
    f.close()
    return open(path).read()

def MakeRequest(url,port=443):
  successful = False
  while not successful:
    try:
      conn = httplib.HTTPSConnection("android-review.googlesource.com",port)
      headers = {"Accept": "application/json,application/jsonrequest","Content-Type": "application/json; charset=UTF-8","Content-Length": len(data)}
      conn.request(method,url,headers)
      conn.set_debuglevel(1)
      successful = True
    except socket.error as err:
        # this means a socket timeout
      if err.errno != 10060:
        raise(err)
      else:
        print err.errno,str(err)
        print "sleep for 1 minute before retrying"
        time.sleep(60)

  resp = conn.getresponse()
  if resp.status != 200:
    raise GerritDataException("Got status code %d for request to %s" % (resp.status,url))
  return resp.read()
#-------------------------------------------------
filename = "%d-ChangeDetails.json"
url = "/gerrit_ui/rpc/ChangeDetailService"
req = {"jsonrpc" : "2.0","method": "changeDetail","params": [{"id": id}],"id": 44
      }
data = GetRequestOrCached(url,"POST",json.dumps(req),filename)
print json.loads(data)

该行导致错误“data = GetRequestOrCached(url,”POST“,filename)”.
如果修复错误的人也检查网站的响应是错误还是正确的响应,我将不胜感激.

req = {"jsonrpc" : "2.0",#                    ^- here
  "id": 44
}