(
(let config (DataSource 'config))

# prepare python udf
(let ui32 (DataType 'Uint32))
(let str (DataType 'String))
(let personType (StructType '('name str) '('age ui32)))
(let udfType (CallableType '() '(personType) '(str) '(ui32)))
(let udfScript (String '@@

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

def NewPerson(name, age):
    return Person(name, age)

@@))
(let udf (ScriptUdf 'Python3 'NewPerson udfType udfScript))

# call udf
(let result (Apply udf (String 'Jamel) (Uint32 '99)))

# output result with type
(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) result '('('type))))

# finish
(let world (Commit! world res_sink))
(return world)
)