pickle模块

dumps是将dict转化成str格式，loads是将str转化成dict格式。

1.创建a（创建字典并把字典里的内容存入另一个文档）

import pickle
accounts = {
    1000:{
        "name":"alex li",
        "email":"lijie@126.com",
        "passwd":"adc123",
        "balance":15000,
        "phone":13651054608,
        "bank_acc":{
            "ICBC":2321434,
            "CBC":413432,
            "ABC":76568,
        }
    },
    1001: {
        "name": "chen li",
        "email": "wangxiao@126.com",
        "passwd": "adcewrf23",
        "balance": 15000,
        "phone": 13651054608,
        "bank_acc": {
            "ICBC": 23214434,
            "CBC": 4132432,
            "ABC": 7655668,
        }
    },
}

f = open("account.db","wb")#表示用写的模式打开文件，可以把每个输入的信息录入在文档里
f.write(pickle.dumps(accounts))#dumps是将dict转化成str格式
f.close()

　2：创建b（修改余额并实时更新内容，此处需要把str内容转成dic的内容）

import pickle

acc_file_name = "account.db"

account_file = open(acc_file_name,"rb")#以读的形式打开
account_dic = pickle.loads(account_file.read())#加载字典数据其中loads将str转化成dict格式
account_file.close()
account_dic[1000]["balance"] -=500
f = open(acc_file_name,"wb")#把更新后的内容写进原文档里
f.write(pickle.dumps(account_dic))
f.close()
print(account_dic)

#扣完钱在写入文件

3；创建c

import pickle
f = open("account.db","rb")
account_db = pickle.loads(f.read())#loads是将str转化成dict格式。
print(account_db)

　其中pickle模块与json大致相同