How to serialize an object that contains a list of other objects

Asked Jun 17 '16 at 14:53

Active Jun 17 '16 at 14:53

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How can I serialize an object that contains a list of other objects?

import json


class Foo:
  def __init__(self, x, y):
    self.x = x
    self.y = y

class Bar:
  def __init__(self):
    self.z = 0
    self.foos = []

bar = Bar()
bar.foos.append(Foo(1, 2))

print(json.dumps(bar.__dict__))

Output

TypeError: <__main__.Foo instance at 0x024DD5F8> is not JSON serializable

asked Jun 17 '16 at 14:53

FrozenHeart

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What? That answer doesn't help me – FrozenHeart Jun 17 '16 at 14:57
In that answer there are recommendatins about using the `__dict__` field that I use already! – FrozenHeart Jun 17 '16 at 14:58
What do you expect the serialized output of `Foo` should be? A common way to do that is to implement your [JSONEncoder](http://stackoverflow.com/questions/3768895/how-to-make-a-class-json-serializable) – gdlmx Jun 17 '16 at 15:00
@gdlmx `{"z": 0, "foos": [{"x": 1, "y": 2}]}` – FrozenHeart Jun 17 '16 at 15:06

How to serialize an object that contains a list of other objects

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