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from __future__ import annotations

class Person:

def __init__(self, name: str, action: Action) -> None:

self.name = name

self.action = action

def do_action(self) -> Action:

print(self.name, self.action.name, end=" ")

return self.action

class Action:

def __init__(self, name: str) -> None:

self.name = name

def amount(self, val: str) -> Action:

print(val, end=" ")

return self

def stop(self) -> None:

print("then stop")

def main():

"""

>>> move = Action('move')

>>> person = Person('Jack', move)

>>> person.do_action().amount('5m').stop()

Jack move 5m then stop

"""

if __name__ == "__main__":

import doctest

doctest.testmod()