chaining_method.py

from __future__ importannotations


classPerson:
def__init__(self, name: str) ->None:
self.name=name

defdo_action(self, action: Action) ->Action:
print(self.name, action.name, end=" ")
returnaction


classAction:
def__init__(self, name: str) ->None:
self.name=name

defamount(self, val: str) ->Action:
print(val, end=" ")
returnself

defstop(self) ->None:
print("then stop")


defmain():
"""
 >>> move = Action('move')
 >>> person = Person('Jack')
 >>> person.do_action(move).amount('5m').stop()
 Jack move 5m then stop
 """


if__name__=="__main__":
importdoctest

doctest.testmod()