How to use the fastavro.io.symbols.Boolean function in fastavro

def read_boolean(self):
        self._parser.advance(Boolean())
        return self.read_value()

elif record_type == "array":
            repeat = Repeater(
                ArrayEnd(),
                ItemEnd(),
                self._parse(schema["items"]),
            )
            return Sequence(repeat, ArrayStart())

        elif record_type == "enum":
            return Sequence(EnumLabels(schema["symbols"]), Enum())

        elif record_type == "null":
            return Null()
        elif record_type == "boolean":
            return Boolean()
        elif record_type == "string":
            return String()
        elif record_type == "bytes":
            return Bytes()
        elif record_type == "int":
            return Int()
        elif record_type == "long":
            return Long()
        elif record_type == "float":
            return Float()
        elif record_type == "double":
            return Double()
        elif record_type == "fixed":
            return Fixed()
        else:
            raise Exception("Unhandled type: {}".format(record_type))

def write_boolean(self, value):
        self._parser.advance(Boolean())
        self.write_value(value)