python使用pickle,marshal进行序列化、反序列及JSON的使用

#!/usr/bin/python
# encoding:utf-8

import pickle
import marshal
import json

#创建一个对象
class Person(object):
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def sayHi(self):
        print 'Hello, my name is', self.name

#继承JSONEncoder和JSONDecoder类，覆写相关方法，实现自定义对象的JSON
class MyEncoder(json.JSONEncoder):
    def default(self, obj):
        # convert object to a dict
        d = {}
        d['__class__'] = obj.__class__.__name__
        d['__module__'] = obj.__module__
        d.update(obj.__dict__)
        return d


class MyDecoder(json.JSONDecoder):
    def __init__(self):
        json.JSONDecoder.__init__(self, object_hook=self.dict2object)

    def dict2object(self, d):
        # convert dict to object
        if '__class__' in d:
            class_name = d.pop('__class__')
            module_name = d.pop('__module__')
            module = __import__(module_name)
            class_ = getattr(module, class_name)
            args = dict((key.encode('ascii'), value) for key, value in d.items())  # get args
            inst = class_(**args)  # create new instance
        else:
            inst = d
        return inst

P = {'B': -0.26268660809250016,
     'E': -3.14e+100,
     'M': -3.14e+100,
     'S': -1.4652633398537678}

def testPickle():
    p1 = Person("Tom", 10)
    p1.sayHi()

    outFile = open("p.p", 'wb')
    pickle.dump(p1, outFile, 1);
    outFile.close()

    inFile = open("p.p", 'rb')
    p2 = pickle.load(inFile)
    inFile.close()
    p2.sayHi()


def testMarshal():
    outFile = open("p.p", 'wb')
    marshal.dump(P, outFile);
    outFile.close()

    start_p = {}
    with open('p.p', 'rb') as f:
        start_p = P
    for a in start_p:
        print(start_p[a])

#测试处理普通的python内置类型
def testJson():
    obj = [[1, 2, 3], 123, 123.123, 'abc', {'key1': (1, 2, 3), 'key2': (4, 5, 6)}]
    encodedjson = json.dumps(obj)
    print repr(obj)
    print encodedjson

    decodejson = json.loads(encodedjson)
    print type(decodejson)
    print decodejson[4]['key1']
    print decodejson

#测试处理自定义类型
def testJsonObj():
    p = Person("Tom", 10)
    d = MyEncoder().encode(p)
    o = MyDecoder().decode(d)

    print d
    print type(o), o
    o.sayHi()

if __name__ == '__main__':
    testPickle()
    print("================================")
    testMarshal()
    print("================================")
    testJson()
    print("================================")
    testJsonObj()
    print("================================")