序列化

序列化 把对象打散成二进制字节 bytes
    1. pickle  把一个对象转化成bytes写入到文件
        pickle.dumps() 把对象转换成bytes
        pickle.loads() 把bytes转化成对象

        pickle.dump() 把对象转换成bytes. 写入到文件
        pickle.load() 把文件中的bytes读取. 转化成对象

    2. shelve 小型数据库, redis, mongodb, dict
        当成字典来用
        writeback=True

    3. json 以前用xml  先在用json
        json.dumps() 把字典转换成json字符串
        json.loads() 把json字符串转化成字典

        json.dump() 把字典转换成json字符串. 写入到文件
        json.load() 把文件中的json字符串读取. 转化成字典

        default = 把对象转化成字典. 需要自己写转换过程
        object_hook = 把字典转化成对象. 需要自己写转换过程

        ensure_ascii = False  可以处理中文


    4. configparser 处理windows配置文件的  dict

class User:
#     def __init__(self, username, password):
#         self.username = username
#         self.password = password
#
#
# class Admin:
#     def regist(self):
#         uname = input("注册账号-->")
#         pswd = input("密码-->")
#         user =User(uname,pswd)
#         pickle.dump(user,open("list_user","ab"))
#         print("注册成功!")
#
#     def login(self):
#         uname = input("--登录账号-->")
#         pswd = input("--密码-->")
#         f = open("list_user","rb")
#
#         while 1:
#             try:
#                 u = pickle.load(f)
#                 if u.username == uname and u.password == pswd:
#                     print("登录成功")
#                     break
#             except Exception as e:
#                 print("登录失败!")
#                 break
#
# u1 = Admin()
# u1.regist()
# u1.regist()
#
# u1.login()
# ----------------------------------
# import shelve
#
# d = shelve.open("pig")    #文件类型的字典
# d['ajx'] = "阿J斯"
# d.close()
#
# d = shelve.open("pig")
# print(d['ajx'])
# d.close()
#
# d = shelve.open("pig")    #文件类型的字典
# d['ajx'] = {"name":"阿J斯","age":18}
# d.close()

# ----------------------------------
import json

# dikt={"A":"西瓜","B":"草莓","C":"香蕉","D":"菠萝"}
# J = json.dumps(dikt,ensure_ascii=False)
# print(J)
# print(type(J))
# print("*" * 80)
# s = '{"A":"西瓜","B":"草莓","C":"香蕉","D":"菠萝"}'
# J1 = json.loads(s)
# print(J1)
# print(type(J1))

# ----------------------------------

# dikt2 = {"A": "西瓜", "B": "草莓", "C": "香蕉", "D": "菠萝"}
# f = open("nainiu.json", "w", encoding="utf8")
# json.dump(dikt2, f, ensure_ascii=False, indent=4)
#
# f1 = open("nainiu.json", "w", encoding="utf8")
# f2 = json.load(f1)
# print(f2)


# ----------------------------------
# class PP:
#     def __init__(self, F_name, L_name):
#         self.F_name = F_name
#         self.L_name = L_name
#
#
# p1 = PP("蒙娜丽莎", "江小白")
#
#
# # 把对象转化成json
# # s = json.dumps(p1.__dict__, ensure_ascii=False)
# # print(s)
#
# def func(obj):
#     return {
#         "firstName": obj.F_name,
#         "lastName": obj.L_name
#     }
#
#
# # s = json.dumps(p1, default=func, ensure_ascii=False)
# # print(s)
#
#
# # ----------------------------------
# s = '{"firstName": "蒙娜丽莎", "lastName": "江小白"}'
# def funk():
#     return PP(dic["firstName"],dic["lastName"])
#
# p = json.loads(s,object_hook=func)
# print(p.lastName,p.lastName)