python: json Deserialization of Python dict

 

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from typing import List import json     class Student(object):     def __init__(self, first_name: str, last_name: str):         self.first_name = first_name         self.last_name = last_name       @property     def FirstNmae(self):         return  self.first_name       @property     def LastNmae(self):         return  self.last_name       class Team(object):     def __init__(self, students: List[Student]):         self.students = students     def print_hi(name):     # Use a breakpoint in the code line below to debug your script.     print(f'Hi, {name} world,geovindu,涂聚文')  # Press Ctrl+F8 to toggle the breakpoint.     # Press the green button in the gutter to run the script. if __name__ == '__main__':     print_hi('PyCharm,geovindu')       student1 = Student(first_name="Geeky", last_name="Guy")     student2 = Student(first_name="GFG", last_name="Rocks")     team = Team(students=[student1, student2])       # Serialization     json_data = json.dumps(team, default=lambda o: o.__dict__, indent=4)     print(json_data)       # Deserialization     decoded_team = Team(**json.loads(json_data))     print(type(decoded_team.students))     for Student in decoded_team.students:         sd=Student         print(sd["first_name"],sd["last_name"])       teamobje = json.loads(json_data)     with open("weatherdatafile.json", "w", encoding='utf-8') as write:         json.dump(teamobje, write, indent=4)  # 可以写成文件       with open('weatherdatafile.json',encoding='utf-8') as json_file:         data = json.load(json_file)         print("data from file:")         print(data)

　　

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import json import pickle from marshmallow import Schema, fields, validate   from dataclasses import dataclass from typing import Optional, List   @dataclass class Book:     title: str     isbn: str   @dataclass class User:     email: str     books: Optional[List[Book]] = None   def validate_isbn(isbn: str) -> None:     """ Validates the isbn with some code (omitted), raise marshmallow.ValidationError if validation did not pass """   class BookSchema(Schema):     title = fields.String(required=True, validate=validate.Length(max=120))     isbn = fields.String(required=True, validate=validate_isbn)   class UserSchema(Schema):     email = fields.Email(required=True)     books = fields.Nested(BookSchema, many=True, required=False)     def print_hi(name):     # Use a breakpoint in the code line below to debug your script.     print(f'Hi, {name} world,geovindu,涂聚文')  # Press Ctrl+F8 to toggle the breakpoint.     # Press the green button in the gutter to run the script. if __name__ == '__main__':     print_hi('PyCharm,geovindu')           #deserialization process:     raw_data_str = """{         "email": "foo@bar.com",         "books": [             {"title": "Hitchhikers Guide to the Galaxy", "isbn": "123456789"},             {"title": "Clean Coder", "isbn": "987654321"}         ]     }"""     json_data = json.loads(raw_data_str)       schema = UserSchema()     user = schema.load(json_data)  # raises if validation fails     print(type(user))  # 辞典类型 dict     print(user)

　　

https://www.augmentedmind.de/2020/10/25/marshmallow-vs-pydantic-python/
https://www.kimsereylam.com/python/2019/10/25/serialization-with-marshmallow.html
https://github.com/marshmallow-code/marshmallow
https://marshmallow.readthedocs.io/en/stable/