網路上查到的方法是使用
.aggregate([{ $sample: { size: 1 } }])

但是我實際上使用時它卻說是無效的語法
想請教各位原因出在哪裡，感謝><

import pymongo
class GetProxy():
    def __init__(self):
        self.DB_URI = pymongo.MongoClient(host='localhost', port=27017)
        self.DB_NAME = self.DB_URI.ip_pool  # 資料庫
        self.DB_COLLECTION = self.DB_NAME.proxy  # 資料表
        
    def get_random_proxy(self):
        result = self.DB_COLLECTION.aggregate([{ $sample: { size: 1 } }])

error code:

Traceback (most recent call last):
  File "D:/【程式設計】/HSIAO_plan/get_proxy/get_proxy/get_proxy.py", line 1, in <module>
    from runProxy import GetProxy
  File "D:\【程式設計】\HSIAO_plan\get_proxy\get_proxy\runProxy.py", line 43
    result = self.DB_COLLECTION.aggregate([{ $sample: { size: 1 } }])
                                             ^
SyntaxError: invalid syntax