request请求中，请求格式json，data内有变量，请求返回格式错误的解决方法

import requests
import json
a = 2967

def test (c):
    cookies = {
        ‘__guid‘: ‘xxxx‘,
        ‘cna‘: ‘u1IqFGLwrC0CAXb5ccVY9A84‘,
        ‘isg‘: ‘xxx-B7JB1kDuKBsu‘,
        ‘monitor_count‘: ‘2‘,
        }

    headers = {
        ‘authority‘: ‘storeapi-dev.xxx.com‘,
        ‘pragma‘: ‘no-cache‘,
        ‘cache-control‘: ‘no-cache‘,
        ‘access-control-request-method‘: ‘GET‘,
        ‘origin‘: ‘https://adminagent-fat.xxx.com‘,
        ‘user-agent‘: ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36‘,
        ‘access-control-request-headers‘: ‘authorization,req-host‘,
        ‘accept‘: ‘*/*‘,
        ‘sec-fetch-site‘: ‘same-site‘,
        ‘sec-fetch-mode‘: ‘cors‘,
        ‘referer‘: ‘https://adminagent-fat.xxx.com/‘,
        ‘accept-encoding‘: ‘gzip, deflate, br‘,
        ‘accept-language‘: ‘zh-CN,zh;q=0.9‘,
        ‘req-host‘: ‘adminagent-fat.xxx.com‘,
        ‘authorization‘: ‘Bearer xxxxx.xxx.XLO4e6X2K70cS3Uz8kDmmhQMWCHg2yifeocnywlKLS8‘,
        ‘content-type‘: ‘application/json; charset=utf-8‘,
        ‘Connection‘: ‘keep-alive‘,
        ‘Pragma‘: ‘no-cache‘,
        ‘Cache-Control‘: ‘no-cache‘,
        ‘User-Agent‘: ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36‘,
        ‘Accept‘: ‘image/webp,image/apng,image/*,*/*;q=0.8‘,
        ‘Sec-Fetch-Site‘: ‘cross-site‘,
        ‘Sec-Fetch-Mode‘: ‘no-cors‘,
        ‘Referer‘: ‘https://adminagent-fat.xxx.com/‘,
        ‘Accept-Encoding‘: ‘gzip, deflate, br‘,
        ‘Accept-Language‘: ‘zh-CN,zh;q=0.9‘,
        }

    params = (
        (‘rend‘, ‘0.8061441194209389‘),
        )

    data = {"Ids":[c]}

    data=json.dumps(data)

    response = requests.post(‘https://storeapi-dev.xxx.com/100000000028/ImageCenter/DelPic‘, headers=headers, params=params, cookies=cookies, data=data)
    print(response.text)
    

for b in range(10000):
    c = a + b
    
    test (c)