如何读取json格式的内容，报错TypeError

如何提取json里面的字典表

import re
import json
import requests

headers={'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36'}
for i in range(1,2):
    param = {
        'cb': 'jQuery112408933494064226006_1636169759698',
        'pn': f'{i}',
        'pz': '20',
        'po': '1',
        'np': '1',
        'ut': 'bd1d9ddb04089700cf9c27f6f7426281',
        'fltt': '2',
        'invt': '2',
        'fid': 'f3',
        'fs': 'm:0 t:80',
        'fields': 'f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f12,f13,f14,f15,f16,f17,f18,f20,f21,f23,f24,f25,f22,f11,f62,f128,f136,f115,f152',
        '_': '1636169759852'
    }
    url = "http://90.push2.eastmoney.com/api/qt/clist/get"
    r = requests.get(url, params=param, headers=headers)
    #r=str(r)
    print(r.text)
    obj=re.search(r"data:(.*)",r.text)
    content=obj.group().replace("data:", "")
    print(content)
    # json_str = json.dumps(param)
    # print("JSON 对象：", json_str)

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