SegmentPortraitPic 的params内容问题

[coallar]

import json from tencentcloud.common import credential from tencentcloud.common.profile.client_profile import ClientProfile from tencentcloud.common.profile.http_profile import HttpProfile from tencentcloud.common.exception.tencent_cloud_sdk_exception import TencentCloudSDKException from tencentcloud.bda.v20200324 import bda_client, models try: cred = credential.Credential("SecretId", "SecretKey") httpProfile = HttpProfile() httpProfile.endpoint = "bda.tencentcloudapi.com"

clientProfile = ClientProfile()
clientProfile.httpProfile = httpProfile
client = bda_client.BdaClient(cred, "", clientProfile)

req = models.SegmentPortraitPicRequest()
params = {

}
req.from_json_string(json.dumps(params))

resp = client.SegmentPortraitPic(req)
print(resp.to_json_string())

except TencentCloudSDKException as err: print(err)

请问 ： params = {}的内容格式是什么？