Try

a_try.py

#!/usr/bin/python3

import abc
from typing import Callable, IO, cast

from east_displayer import Output, OutputStream
from east_typer import StringComputer, String, StringReceiver, ReceiverOfString

class MessageTemplating(metaclass=abc.ABCMeta):

    @abc.abstractmethod
    def recipient_of_message_templatize_is(self, receiver: 'ReceiverOfString') -> 'MessageTemplating':
        """Message factoring"""

class Messagerable(metaclass=abc.ABCMeta):

    @abc.abstractmethod
    def recipient_to_output_with_string_is(self, message: 'String', receiver_output: 'Output') -> 'Messagerable':
        """Message factoring"""


        return self

class MessagerTemplate(MessageTemplating):

    def recipient_of_message_templatize_is(self, message: 'String', receiver: 'ReceiverOfString') -> 'MessageTemplating':
        """Show notice"""

        message.recipient_of_string_is(
                StringReceiver(
                    lambda message: String("Notice : " + message + '\n').recipient_of_string_is(receiver)
            )
        )

        return self

class Messager(Messagerable):

    def __init__(self, template: 'MessageTemplating' = MessagerTemplate()):

        self.template = template

    def recipient_to_output_with_string_is(self, message: 'String', receiver_output: 'Output') -> 'Messagerable':

        self.template.recipient_of_message_templatize_is(
            message,
            StringReceiver(
                lambda message_well_formated: String(message_well_formated).recipient_of_string_is(
                    StringReceiver(
                        lambda end_message: receiver_output.output_value_is(end_message)
                    )
                )
            )
        )

        return self