python3中json模块的用法

 __author__ = "JentZhang"

 import json

 user_info = {"id": 1000, "name": "zhangsan", "age": 25, "address": "xxxxxxxxxx", "mobile": ""}

 # 将字典转换为JSON字符串
 json_str = json.dumps(user_info)
 print(json_str)
 print(type(json_str))

 # 将JSON字符串转换为字典
 str_json = '{"name":"zhangsan","age":20}'
 json_obj = json.loads(str_json)
 print(json_obj)
 print(type(json_obj))

 f = open('json_file','w')
 dic = {'k1':'v1','k2':'v2','k3':'v3'}
 json.dump(dic,f)  #dump方法接收一个文件句柄，直接将字典转换成json字符串写入文件
 f.close()

 f = open('json_file')
 dic2 = json.load(f)  #load方法接收一个文件句柄，直接将文件中的json字符串转换成数据结构返回
 f.close()
 print(type(dic2),dic2)