test2.py

# coding: utf-8
import json

class Spam(object):
    def __init__(self, name, value):
        self.name = name
        self.value = value

    def __repr__(self):
        return "<%s: name=%s, value=%s>" % (
            self.__class__.__name__,
            self.name,
            self.value)

    def as_dict(self):
        return {'name': self.name, 'value': self.value}

    @classmethod
    def from_dict(cls, data):
        return cls(data['name'], data['value'])

def main():
    obj = Spam('Furukawa', 'bucho')
    print "original: %s" % obj
    s = json.dumps(obj.as_dict())
    print "======================="
    print s
    print "======================="
    obj_2 = Spam.from_dict(json.loads(s))
    print "json.loads: %s" % obj_2

if __name__ == '__main__':
    main()