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from dataclasses import dataclass
from typing import Optional, Collection, Any
from abc import abstractmethod
class DeviceLifecycleState:
pass # TODO(Homework #3)
class DevaceError(Exception):
pass
class NonReadableTrait(Exception):
pass
class NonWritableTrait(Exception):
pass
@dataclass
class TraitDescriptor:
name: str
info: Optional[str] = None
readable: bool = True
writable: bool = False
@dataclass
class ActionDescriptor:
name: str
arguments: dict[str, type]
info: Optional[str] = None
class Device:
# TODO(Homework #3)
_state = DeviceLifecycleState.INIT
@property
def state(self) -> DeviceLifecycleState:
return self._state
def close(self):
self._state = DeviceLifecycleState.CLOSE
def trait_descriptors(self) -> Collection[TraitDescriptor]:
pass
def action_descriptors(self) -> Collection[ActionDescriptor]:
pass
@abstractmethod
def __getitem__(self, trait_name: str) -> Optional[Any]:
"""Return logical state of trait `trait_name`."""
pass
class SynchronyDevice(Device):
def open(self):
self._state = DeviceLifecycleState.OPEN
@abstractmethod
def execute(self, action_name: str, *args, **kwargs):
"""Execute action `action_name`, using `args` and `kwargs` as action argument."""
pass
@abstractmethod
def read(self, trait_name: str) -> Any:
"""Read physical state of trait `trait_name` from device."""
raise NonReadableTrait
@abstractmethod
def write(self, trait_name: str, value: Any) -> bool:
"""Pass `value` to trait `trait_name` of device."""
raise NonWritableTrait
@abstractmethod
def invalidate(self, trait_name: str):
"""Invalidate logical state of trait `trait_name`"""
pass

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from turtle import Turtle
from controls.device import SynchronyDevice
class TurtleDevice(SynchronyDevice):
pass # TODO(Homework #3)

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import cmd
import threading
from queue import Queue
from equipment.turtle_device import TurtleDevice
class TurtleDeviceThread(threading.Thread):
# TODO(Homework 4)
def __init__(self):
super().__init__()
self.device = TurtleDevice()
self.queue = Queue()
class NoBlockingTurtleShell(cmd.Cmd):
intro = 'Welcome to the turtle shell. Type help or ? to list commands.\n'
prompt = '(turtle) '
file = None
def __init__(self, turtle_thread: TurtleDeviceThread):
pass # TODO(Homework 4)
def do_execute(self, arg):
pass # TODO(Homework 4)
def do_exit(self, arg):
pass # TODO(Homework 4)
if __name__ == '__main__':
turtle_thread = TurtleDeviceThread()
# TODO(Homework 4: Correct start thread)
NoBlockingTurtleShell(turtle_thread).cmdloop()

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from unittest import TestCase
from controls.device import DeviceLifecycleState
class DeviceLifecycleStateTest(TestCase):
def setUp(self) -> None:
pass
def test_enum(self):
self.assertEqual(DeviceLifecycleStateTest["INIT"], DeviceLifecycleStateTest.INIT)

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from unittest import TestCase
from equipment.turtle_device import TurtleDevice
class TurtleDeviceTest(TestCase):
def setUp(self) -> None:
self.device = TurtleDevice()
def test_open(self):
self.device.open()
self.device.close()

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import cmd, sys
from turtle import *
class TurtleShell(cmd.Cmd):
intro = 'Welcome to the turtle shell. Type help or ? to list commands.\n'
prompt = '(turtle) '
file = None
# ----- basic turtle commands -----
def do_forward(self, arg):
'Move the turtle forward by the specified distance: FORWARD 10'
forward(*parse(arg))
def do_right(self, arg):
'Turn turtle right by given number of degrees: RIGHT 20'
right(*parse(arg))
def do_left(self, arg):
'Turn turtle left by given number of degrees: LEFT 90'
left(*parse(arg))
def do_goto(self, arg):
'Move turtle to an absolute position with changing orientation. GOTO 100 200'
goto(*parse(arg))
def do_home(self, arg):
'Return turtle to the home position: HOME'
home()
def do_circle(self, arg):
'Draw circle with given radius an options extent and steps: CIRCLE 50'
circle(*parse(arg))
def do_position(self, arg):
'Print the current turtle position: POSITION'
print('Current position is %d %d\n' % position())
def do_heading(self, arg):
'Print the current turtle heading in degrees: HEADING'
print('Current heading is %d\n' % (heading(),))
def do_color(self, arg):
'Set the color: COLOR BLUE'
color(arg.lower())
def do_undo(self, arg):
'Undo (repeatedly) the last turtle action(s): UNDO'
def do_reset(self, arg):
'Clear the screen and return turtle to center: RESET'
reset()
def do_bye(self, arg):
'Stop recording, close the turtle window, and exit: BYE'
print('Thank you for using Turtle')
self.close()
bye()
return True
# ----- record and playback -----
def do_record(self, arg):
'Save future commands to filename: RECORD rose.cmd'
self.file = open(arg, 'w')
def do_playback(self, arg):
'Playback commands from a file: PLAYBACK rose.cmd'
self.close()
with open(arg) as f:
self.cmdqueue.extend(f.read().splitlines())
def precmd(self, line):
line = line.lower()
if self.file and 'playback' not in line:
print(line, file=self.file)
return line
def close(self):
if self.file:
self.file.close()
self.file = None
def parse(arg):
'Convert a series of zero or more numbers to an argument tuple'
return tuple(map(int, arg.split()))
if __name__ == '__main__':
TurtleShell().cmdloop()