使用blpapi和xbbg从Bloomberg获取会员持股和权重数据？

import blpapi
import xbbg

sessionOptions = blpapi.SessionOptions()
sessionOptions.setServerHost("服务器地址")
sessionOptions.setServerPort(服务器端口号)

session = blpapi.Session(sessionOptions)
session.start()

request = session.createRequest("ReferenceDataRequest")

# 设置请求的证券代码
request.getElement("securities").appendValue("证券代码")

# 设置请求的字段
request.getElement("fields").appendValue("持股数据字段")
request.getElement("fields").appendValue("权重数据字段")

# 发送请求
session.sendRequest(request)

# 等待数据响应
while True:
    ev = session.nextEvent()
    if ev.eventType() == blpapi.Event.RESPONSE:
        break

# 处理数据响应
data = []
for msg in ev:
    securities = msg.getElement("securityData")
    for security in securities.values():
        fieldData = security.getElement("fieldData")
        holdingData = fieldData.getElement("持股数据字段").getValue()
        weightData = fieldData.getElement("权重数据字段").getValue()
        data.append((holdingData, weightData))

session.stop()