简单对象或者字典转json

import json
d = {'a': 'aaa', 'b': ['b1', 'b2', 'b3'], 'c': 100}
json_str = json.dumps(d)
print json_str

lambda 方式实现class转换json

import json
class Customer:
    def __init__(self, name, grade, age, home, office):
        self.name = name
        self.grade = grade
        self.age = age
        self.address = Address(home, office)
    def __repr__(self):
        return repr((self.name, self.grade, self.age,self.address.home, self.address.office))
customers = [
Customer('john', 'A', 15, '111', 'aaa'),
Customer('jane', 'B', 12, '222', 'bbb'),
Customer('dave', 'B', 10, '333', 'ccc'),
]
json_str = json.dumps(customers, default=lambda o: o.__dict__, sort_keys=True, indent=4)
print json_str

成功运行输出如下：

[
{
"address": {
"home": "111",
"office": "aaa"
},
"age": 15,
"grade": "A",
"name": "john"
},
{
"address": {
"home": "222",
"office": "bbb"
},
"age": 12,
"grade": "B",
"name": "jane"
},
{
"address": {
"home": "333",
"office": "ccc"
},
"age": 10,
"grade": "B",
"name": "dave"
}
]

可能遇到的问题–中文乱码

解决方法 —增加ensure_ascii=False属性

json.dumps 进行序列化时，默认使用ascii编码， print json.dumps(dic)输出unicode编码的结果： {“a”: “\u4e2d\u56fd”}
json.dumps(dic,ensure_ascii=False)，不使用ascii编码，输出结果为：{“a”: “中国”}
但是有时也碰到 json.dumps(m,ensure_ascii=False)之后依旧是乱码的格式，可采取下面方式处理：

#coding=utf-8
import json 
dic = {"a":"中国"}
print json.dumps(dic,ensure_ascii=False).decode("utf-8").encode("gb2312") #{"a":"中国"}

遍历方式实现class转换json

# -*- encoding: UTF-8 -*-
class Student:
  name = ''
  age = 0
  def __init__(self, name, age):
    self.name = name
    self.age = age
def convert_to_dict(obj):
  '''把Object对象转换成Dict对象'''
  dict = {}
  dict.update(obj.__dict__)
  return dict
def convert_to_dicts(objs):
  '''把对象列表转换为字典列表'''
  obj_arr = []
  for o in objs:
    #把Object对象转换成Dict对象
    dict = {}
    dict.update(o.__dict__)
    obj_arr.append(dict)
  return obj_arr
def class_to_dict(obj):
  '''把对象(支持单个对象、list、set)转换成字典'''
  is_list = obj.__class__ == [].__class__
  is_set = obj.__class__ == set().__class__
  if is_list or is_set:
    obj_arr = []
    for o in obj:
      #把Object对象转换成Dict对象
      dict = {}
      dict.update(o.__dict__)
      obj_arr.append(dict)
    return obj_arr
  else:
    dict = {}
    dict.update(obj.__dict__)
    return dict
stu = Student('zhangsan', 20)
print '-----------'
print convert_to_dict(stu)
print '-----------'
print convert_to_dicts([stu, stu])
print '-----------'
print class_to_dict(stu)
print '-----------'
print class_to_dict([stu, stu])
stua = Student('zhangsan', 20)
stub = Student('lisi', 10)
stu_set = set()
stu_set.add(stua)
stu_set.add(stub)
print class_to_dict(stu_set)

成功输出如下：

-----------
{'age': 20, 'name': 'zhangsan'}
-----------
[{'age': 20, 'name': 'zhangsan'}, {'age': 20, 'name': 'zhangsan'}]
-----------
{'age': 20, 'name': 'zhangsan'}
-----------
[{'age': 20, 'name': 'zhangsan'}, {'age': 20, 'name': 'zhangsan'}]
[{'age': 10, 'name': 'lisi'}, {'age': 20, 'name': 'zhangsan'}]