python接口请求 JSON parse error: Unrecognized token 'type': was expecting 'null'

报错的原因：传参不正确，协议头信息的Content-Type字段定义了请求格式，传json数据请求头为：Content-Type：application/json
可以先查看参数的类型：print(type(data))
data1 = json.dumps(data)#类型转换
r = requests.post(url=url, headers=headers, data=data1)
res = requests.post(url=url, params=params, json=data, headers=headers)