vviora_advanced-python-home.../noblocking_turtle_shell.py

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import cmd
import threading
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from queue import Queue, Empty
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from equipment.turtle_device import TurtleDevice
class TurtleDeviceThread(threading.Thread):
# TODO(Homework 4)
def __init__(self):
super().__init__()
self.device = TurtleDevice()
self.queue = Queue()
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def run(self):
while True:
try:
item = self.queue.get()
except self.queue.Empty:
continue
else:
if (item == 'exit'):
break
self.device.execute(item[0], item[1:])
self.queue.task_done()
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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):
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self.turtle_thread = TurtleDeviceThread()
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def do_execute(self, arg):
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self.turtle_thread.queue.put(arg)
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def do_exit(self, arg):
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self.turtle_thread.queue.put('exit')
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if __name__ == '__main__':
turtle_thread = TurtleDeviceThread()
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turtle_thread.start()
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NoBlockingTurtleShell(turtle_thread).cmdloop()