用JSON编码嵌套的python对象 [英] Encoding nested python object in JSON

问题描述

我想用JSON编码对象.但是，我不知道如何在不转义字符串的情况下进行输出.

I want to encode objects in JSON. But, I can not figure out how to make the output without the string escaping.

import json

class Abc:
    def __init__(self):
        self.name="abc name"
    def toJSON(self):
        return json.dumps(self.__dict__, cls=ComplexEncoder)

class Doc:
    def __init__(self):
        self.abc=Abc()
    def toJSON(self):
        return json.dumps(self.__dict__, cls=ComplexEncoder)

class ComplexEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, Abc) or isinstance(obj, Doc):
            return obj.toJSON()
        else:
            return json.JSONEncoder.default(self, obj)

doc=Doc()
print doc.toJSON()

结果是(转储返回字符串表示形式，这就是为什么转义"的原因)

The result is (the dumps returns a string representation, that's why the " are escaped)

{"abc": "{\"name\": \"abc name\"}"}

我想要一些不同的东西.预期结果是

I want something a little bit different. The expected result is

{"abc": {"name": "abc name"}"}

但是我不知道如何... 有什么提示吗?

But I don't see how to... Any hint ?

提前谢谢.

推荐答案

我以前的示例，带有另一个嵌套对象和您的建议:

my previous sample, with another nested object and your advices :

import json

class Identity:
    def __init__(self):
        self.name="abc name"
        self.first="abc first"
        self.addr=Addr()
    def reprJSON(self):
        return dict(name=self.name, firstname=self.first, address=self.addr) 

class Addr:
    def __init__(self):
        self.street="sesame street"
        self.zip="13000"
    def reprJSON(self):
        return dict(street=self.street, zip=self.zip) 

class Doc:
    def __init__(self):
        self.identity=Identity()
        self.data="all data"
    def reprJSON(self):
        return dict(id=self.identity, data=self.data) 

class ComplexEncoder(json.JSONEncoder):
    def default(self, obj):
        if hasattr(obj,'reprJSON'):
            return obj.reprJSON()
        else:
            return json.JSONEncoder.default(self, obj)

doc=Doc()
print "Str representation"
print doc.reprJSON()
print "Full JSON"
print json.dumps(doc.reprJSON(), cls=ComplexEncoder)
print "Partial JSON"
print json.dumps(doc.identity.addr.reprJSON(), cls=ComplexEncoder)

产生预期的结果:

Str representation
{'data': 'all data', 'id': <__main__.Identity instance at 0x1005317e8>}
Full JSON
{"data": "all data", "id": {"name": "abc name", "firstname": "abc first", "address": {"street": "sesame street", "zip": "13000"}}}
Partial JSON
{"street": "sesame street", "zip": "13000"}

谢谢.

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