python持久化物件

2022-05-02 04:03:07 字數 530 閱讀 1425

通過shelve模組即可持久化物件

import shelve


import numpy as np


def writeobj(name,obj):


with shelve.open('object') as db:


db[name]=obj


def readobj(name):


try:


with shelve.open('object') as db:


return db[name]


except baseexception:


return none


if __name__ == '__main__':


a=np.array([1,2,3])


writeobj('arr',a)


print(readobj('arr'))


pass
吧乙個物件持久化之後，不需要import原來物件依賴的庫，就可以呼叫物件所有的屬性、方法：

python 物件持久化

print open persondb.dat rb read testdemo2.py 讀取資料庫 載入乙個例項的時候，類極其模組的檔案都必須匯入 該類的例項再次載入的時候，對類的源 檔案的修改會自動選取 import testdemo import shelve db shelve.open p...

python物件持久化

pickle模組 import pickle person s pickle.dumps person p pickle.loads s pickle.dump person,open pickle db wb p pickle.load open pickle db rb print p prin...

物件持久化

物件持久化 ifname main read scores pickle 將字典表序列化成字串pickle.dumps 字串變回字典用pickle.loads s import pickle person s pickle.dumps person 序列化 p pickle.loads s 恢復 序...