#!/usr/bin/env python # -*- coding: utf-8 -*- #json_extention #2014-03-16 #copyright: orangleliu #license: BSD  ''''' python中dumps方法很好用，可以直接把我們的dict直接序列化為json對(duì)象 但是有的時(shí)候我們加了一些自定義的類就沒法序列化了，這個(gè)時(shí)候需要 自定義一些序列化方法  參考： http://docs.python.org/2.7/library/json.html  例如: In [3]: from datetime import datetime  In [4]: json_1 = {'num':1112, 'date':datetime.now()}  In [5]: import json  In [6]: json.dumps(json_1) --------------------------------------------------------------------------- TypeError                 Traceback (most recent call last) D:/devsofts/python2.7/lib/site-packages/django/core/management/commands/shell.py c in <module>() ----> 1 json.dumps(json_1)  TypeError: datetime.datetime(2014, 3, 16, 13, 47, 37, 353000) is not JSON serial izable '''  from datetime import datetime import json  class DateEncoder(json.JSONEncoder ):   def default(self, obj):     if isinstance(obj, datetime):       return obj.__str__()     return json.JSONEncoder.default(self, obj)  json_1 = {'num':1112, 'date':datetime.now()} print json.dumps(json_1, cls=DateEncoder)  ''''' 輸出結(jié)果：  PS D:/code/python/python_abc> python ./json_extention.py {"date": "2014-03-16 13:56:39.003000", "num": 1112} '''  #我們自定義一個(gè)類試試 class User(object):   def __init__(self, name):     self.name = name  class UserEncoder(json.JSONEncoder):   def default(self, obj):     if isinstance(obj, User):       return obj.name     return json.JSONEncoder.default(self, obj)  json_2 = {'user':User('orangle')} print json.dumps(json_2, cls=UserEncoder)  ''''' PS D:/code/python/python_abc> python ./json_extention.py {"date": "2014-03-16 14:01:46.738000", "num": 1112} {"user": "orangle"}  '''