Python 3：JSON 不可序列化

在Python编程中，JSON（JavaScript Object Notation）是一种常用的数据交换格式。它使用易于人类阅读和编写的文本格式来表示结构化数据。然而，有时候在处理JSON数据时，我们会遇到一个问题：JSON对象不能被直接序列化。

python
import json
from datetime import datetime
class Person:
    def __init__(self, name, age, birthdate):
        self.name = name
        self.age = age
        self.birthdate = birthdate
class PersonEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, Person):
            return {'name': obj.name, 'age': obj.age, 'birthdate': obj.birthdate.strftime('%Y-%m-%d')}
        return super().default(obj)
person = Person('Alice', 25, datetime(1995, 5, 10))
person_json = json.dumps(person, cls=PersonEncoder)
print(person_json)

python
import json
from datetime import datetime
class Event:
    def __init__(self, name, date):
        self.name = name
        self.date = date
class EventEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, Event):
            return {'name': obj.name, 'date': obj.date.strftime('%Y-%m-%d')}
        return super().default(obj)
class ComplexObject:
    def __init__(self, events):
        self.events = events
events = [Event('Event 1', datetime(2022, 1, 1)), Event('Event 2', datetime(2022, 2, 1))]
complex_object = ComplexObject(events)
complex_object_json = json.dumps(complex_object, cls=EventEncoder)
print(complex_object_json)