import json
 student = {
     'name': 'johnny',
     'age': 27,
     'address': '無錫'
 }
 print(json.dumps(student, ensure_ascii=False))
# {"name": "johnny", "age": 27, "address": "無錫"}  json

import json
json_student = '{"name": "johnny", "age": 27, "address": "無錫"}'
print(json.loads(json_student))
# {'name': 'johnny', 'age': 27, 'address': '無錫'} 字典dict

import json
class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
student = Student('candy', '30')
#錯(cuò)誤使用！?。?
print(json.dumps(student))  報(bào)錯(cuò)?。。?TypeError: Object of type Student is not JSON serializable

#正確使用?。?！
print(json.dumps(student.__dict__))) #可以使用 類對象的 __dict__ 屬性
#{"name": "candy", "age": "30"}

class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
    @staticmethod
    def conver2json(self):
        return {
            'name': self.name,
            'age': self.age
        }
#通過自己寫一個(gè) conver2json方法 去手動(dòng)轉(zhuǎn)化一下 把 類對象轉(zhuǎn)成json 
print(json.dumps(student,default=Student.conver2json))

import json
class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
    @staticmethod
    def conver2json(self):
        return {
            'name': self.name,
            'age': self.age
        }
    @staticmethod
    def convert2object(dict):
        return Student(dict['name'],dict['age'])
json_student = '{"name": "johnny", "age": 27, "address": "無錫"}'
print(json.loads(json_student,object_hook=Student.convert2object))
#<__main__.Student

student = {
    'name': 'johnny',
    'age': 27,
    'address': '無錫'
}
with open('student.json','w') as f:
    json.dump(student,f,ensure_ascii=False)

with open('student.json','r')  as f:
    print(json.load(f))

class Student:
    def __init__(self, name, age):
        self.name = name,  #這里?。?！不能有 逗號。。 
        self.age = age
student = Student('candy', '30')
print(json.dumps(student.__dict__))
#猜猜它的打印是什么 
#{"name": ["candy"], "age": "30"}