到目前為止，在我的代碼中，我成功地將數(shù)據(jù)存儲到 mongoDB 中?，F(xiàn)在我希望能夠檢索我存儲的數(shù)據(jù)。正如你所看到的，我一直在嘗試，但不斷出現(xiàn)錯誤。使用 BSON 時，我是否必須首先解碼數(shù)據(jù)才能從 mongoDB 檢索數(shù)據(jù)？任何幫助將不勝感激！（對混亂的代碼表示歉意，我只是通過反復試驗進行練習）import jsonfrom json import JSONEncoderimport pymongo from pymongo import MongoClientfrom bson.binary import Binaryimport pickle#Do this for each client = MongoClient("localhost", 27017)db = client['datacampdb']coll = db.personpractice4_collection  #creating a collection in the database #my collection on the database is called personpractice4_collection class Person:    def __init__(self, norwegian, dame, brit, german, sweed):        self.__norwegian = norwegian        self.__dame = dame        self.__brit = brit        self.__german = german #private variable         self.__sweed = sweed    # create getters and setters later to make OOP personone = Person("norwegian", "dame", "brit", "german","sweed")  class PersonpracticeEncoder(JSONEncoder):         def default(self, o):            return o.__dict__    #Encode Person Object into JSON"personpracticeJson = json.dumps(personone, indent=4, cls=PersonpracticeEncoder)practicedata = pickle.dumps(personpracticeJson)coll.insert_one({'bin-data': Binary(practicedata)})#print(personpracticeJson)#print(db.list_collection_names()) #get then names of my collections in DB #retriving data from mongodb #Retrieving a Single Document with find_one()print(({'bin-data': Binary(practicedata)}).find_one()) #not working