Python Algorithm: create Object from JSON

As shown in the following example, you can use the @wrap (which return another wrapper) to to transfer JSON to object in the python.

This blog written conjunction with the Python Algorithm to flattening JSON ¹.

from functools import wraps

def json_to_object(func):
    @wraps(func)
    def wrapper(self, d):
        for name, value in d.iteritems():
            setattr(self, name,value)
        return func(self, d)
    return wrapper


class Person(object):
    @json_to_object
    def __init__(self, d):
        pass

a = Person({'firstName':'Tom', 'lastName':'Hanks', 'age':50})

a.firstName
a.lastName
a.age

More advanced version

from functools import wraps

def json_to_object(func):
    @wraps(func)
    def wrapper(self, d):
        for name, value in d.iteritems():
            if type(value) == dict:
                print(value)
                setattr(self,name,Person.fromJson(value))
            else:
                setattr(self, name,value)
        return func(self, d)
    return wrapper


class Base(object):

    @json_to_object
    def __init__(self,d):
        pass


class Person(Base):
    @classmethod
    def fromJson(cls, json_data):
        return cls(json_data)
    

a = Person.fromJson({'name':{'firstName':'Tom', 'lastName':'Hanks'}, 'age':20})

a.__dict__
a.name.lastName
a.name.firstName

Reference

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1. Blog post Python Algorithm to flattening JSON ↩