定义一个Python class

class Node:
    def __init__(self):
        self.ip = ""
        self.pods = []
        self.count = 0

Json 对象（instance) 转 dict 和字符串 

n = Node()
n.count = 1
n.ip = "127.0.0.1"
n.pods = ["pod-x", "pod-y", "pod-z"]

# Json Object
print(n)         # <__main__.Node instance at 0x7f4eaa078eb0>
print(n.ip)
print(type(n))   # <type 'instance'>

# Json Object to Dict
print(n.__dict__)
print(n.__dict__["ip"])

# Json Object to String
json_str = json.dumps(n.__dict__, indent = 4)
print(json_str)

Json dict 按特定key的value 排序 

n1 = Node()
n1.count = 2
n1.ip = "127.0.0.2"
n1.pods = ["pod-x2", "pod-y2"]

n2 = Node()
n2.count = 3
n2.ip = "127.0.0.2"
n2.pods = ["pod-x3", "pod-y3", "pod-z3"]

nodes = [n, n1, n2]

# json object array to string
nodes_jsonstr = json.dumps(nodes, default = lambda o : o.__dict__, indent=4)
print(nodes_jsonstr)
print(type(nodes_jsonstr))     # <type 'str'>

# json string to dict
json.loads(nodes_jsonstr)

# dict sort
nodes_array = sorted(json.loads(nodes_jsonstr), key = lambda e : e["count"], reverse = False)
print(nodes_array[0])
print(nodes_array[0]['ip'])
print(type(nodes_array[0]))   # <type 'dict'>

 dict似乎无法直接转为Json Object， 但可以实现. 方法

class Dict(dict):
    __setattr__ = dict.__setitem__
    __getattr__ = dict.__getitem__

def dictToObj(dictObj):
    if not isinstance(dictObj, dict):
        return dictObj
    d = Dict()
    for k, v in dictObj.items():
        d[k] = dictToObj(v)

    return d

n_obj = dictToObj(nodes_array[0])
print(n_obj.ip)
print(type(n_obj)) # <class '__main__.Dict'>