An object encoder that will recursively encode arbitrary python objects

json_object_encoder.py

# This is a minor modification of http://stackoverflow.com/a/35483750/1543555

class JSONObjectEncoder(json.JSONEncoder):
    def default(self, obj):
        if hasattr(obj, "to_json"):
            return self.default(obj.to_json())
        else:
            if isinstance(obj, dict):
                return obj
            elif isinstance(obj, datetime.datetime):
                return obj.isoformat()
            elif isinstance(obj, datetime.timedelta):
                return str(obj)
            elif isinstance(obj, set):
                return list(obj)
            else:
                d = dict(
                    (key, value)
                    for key, value in inspect.getmembers(obj)
                    if not key.startswith("__")
                    and not inspect.isabstract(value)
                    and not inspect.isbuiltin(value)
                    and not inspect.isfunction(value)
                    and not inspect.isgenerator(value)
                    and not inspect.isgeneratorfunction(value)
                    and not inspect.ismethod(value)
                    and not inspect.ismethoddescriptor(value)
                    and not inspect.isroutine(value)
                )

                return self.default(d)