Pytho中dict(或对象)与json之间的互相转化

Python之dict(或对象)与json之间的互相转化
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()
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对象转json数据

import json

def obj_to_json():
stu = Student('007', '007', 28, 'male', '13000000000', '123@qq.com')
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': '123@qq.com'}
j = json.dumps(obj=stu)
print(j) # {"id": "007", "name": "007", "age": 28, "sex": "male", "phone": "13000000000", "email": "123@qq.com"}

if __name__ == '__main__':
obj_to_json()
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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": "123@qq.com"}'
dict = json.loads(s=j)
print(dict) # {'id': '007', 'name': '007', 'age': 28, 'sex': 'male', 'phone': '13000000000', 'email': '123@qq.com'}

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": "123@qq.com"}'
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: 123@qq.com

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()
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•  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()
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