JSON serialization (creating new or refactoring existing implementation)

Created by: Durman

Will see if it is possible to make it in more OOP way.

class A:
    def __init__(self, v):
        self.v = v
    def to_json(self):
        return {type(self).__name__: {'v': self.v, }}

def json_encoder(o):
    try:
        return o.to_json()
    except AttributeError:
        raise TypeError

json.dumps([1,2,3,A(1)], default=json_encoder)
'[1, 2, 3, {"A": {"v": 1}}]'