docusignapi -如何从签名者那里获得文件"sentDateTime“？

import docusign_esign as docusign

# 设置Docusign API的访问凭证
access_token = "YOUR_ACCESS_TOKEN"
base_path = "https://demo.docusign.net/restapi"

# 创建Docusign API客户端
api_client = docusign.ApiClient()
api_client.host = base_path
api_client.set_default_header("Authorization", "Bearer " + access_token)

# 创建EnvelopeRecipientsApi实例
recipients_api = docusign.EnvelopeRecipientsApi(api_client)

# 指定要获取信息的信封ID和收件人ID
envelope_id = "YOUR_ENVELOPE_ID"
recipient_id = "YOUR_RECIPIENT_ID"

# 调用EnvelopeRecipients::list方法获取收件人信息
recipients_response = recipients_api.list(account_id, envelope_id)

# 遍历收件人列表，找到指定收件人的信息
for recipient in recipients_response.signers:
    if recipient.recipient_id == recipient_id:
        sent_datetime = recipient.sent_date_time
        print("Sent DateTime: ", sent_datetime)
        break