Python之dict(或对象)与json之间的互相转化实例

在Python语言中，json数据与dict字典以及对象之间的转化，是必不可少的操作。

在Python中自带json库。通过import json导入。

在json模块有2个方法，

loads()：将json数据转化成dict数据

dumps()：将dict数据转化成json数据

load()：读取json文件数据，转成dict数据

dump()：将dict数据转化成json数据后写入json文件

下面是具体的示例：

dict字典转json数据

import json
def dict_to_json():
 dict = {}
 dict['name'] = 'many'
 dict['age'] = 10
 dict['sex'] = 'male'
 print(dict) # 输出：{'name': 'many', 'age': 10, 'sex': 'male'}
 j = json.dumps(dict)
 print(j) # 输出：{"name": "many", "age": 10, "sex": "male"}
if __name__ == '__main__':
 dict_to_json()

对象转json数据

import json
def obj_to_json():
 stu = Student('007', '007', 28, 'male', '13000000000', '[email protected]')
 print(type(stu)) # <class 'json_test.student.Student'>
 stu = stu.__dict__ # 将对象转成dict字典
 print(type(stu)) # <class 'dict'>
 print(stu) # {'id': '007', 'name': '007', 'age': 28, 'sex': 'male', 'phone': '13000000000', 'email': '[email protected]'}
 j = json.dumps(obj=stu)
 print(j) # {"id": "007", "name": "007", "age": 28, "sex": "male", "phone": "13000000000", "email": "[email protected]"}
if __name__ == '__main__':
 obj_to_json()

json数据转成dict字典

import json
def json_to_dict():
 j = '{"id": "007", "name": "007", "age": 28, "sex": "male", "phone": "13000000000", "email": "[email protected]"}'
 dict = json.loads(s=j)
 print(dict) # {'id': '007', 'name': '007', 'age': 28, 'sex': 'male', 'phone': '13000000000', 'email': '[email protected]'}
if __name__ == '__main__':
 json_to_dict()

json数据转成对象

import json
def json_to_obj():
 j = '{"id": "007", "name": "007", "age": 28, "sex": "male", "phone": "13000000000", "email": "[email protected]"}'
 dict = json.loads(s=j)
 stu = Student()
 stu.__dict__ = dict
 print('id: ' + stu.id + ' name: ' + stu.name + ' age: ' + str(stu.age) + ' sex: ' + str(
 stu.sex) + ' phone: ' + stu.phone + ' email: ' + stu.email) # id: 007 name: 007 age: 28 sex: male phone: 13000000000 email: [email protected]
if __name__ == '__main__':
 json_to_obj()

json的load()与dump()方法的使用

dump()方法的使用

import json
def dict_to_json_write_file():
 dict = {}
 dict['name'] = 'many'
 dict['age'] = 10
 dict['sex'] = 'male'
 print(dict) # {'name': 'many', 'age': 10, 'sex': 'male'}
 with open('1.json', 'w') as f:
 json.dump(dict, f) # 会在目录下生成一个1.json的文件，文件内容是dict数据转成的json数据
if __name__ == '__main__':
 dict_to_json_write_file()

load()的使用

import json
def json_file_to_dict():
 with open('1.json', 'r') as f:
 dict = json.load(fp=f)
 print(dict) # {'name': 'many', 'age': 10, 'sex': 'male'}
if __name__ == '__main__':
 json_file_to_dict()