advanced-python-homework-2023/noblocking_turtle_shell.py

60 lines
1.6 KiB
Python

import cmd
from threading import Thread, Event
from turtle import bye
from queue import Queue, Empty
from equipment.turtle_device import TurtleDevice
class TurtleDeviceThread(Thread):
def __init__(self):
super().__init__()
self.device = TurtleDevice()
self.queue = Queue()
def run(self):
while True:
try:
item = self.queue.get()
except self.queue.Empty:
continue
else:
if (item == 'exit'):
break
self.device.execute(*item)
self.queue.task_done()
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):
super(NoBlockingTurtleShell, self).__init__()
self.turtle_thread = turtle_thread
def do_execute(self, arg):
self.turtle_thread.queue.put(parse(arg))
def do_exit(self, arg):
self.close()
self.turtle_thread.queue.put("exit")
print('Thank you for using Turtle')
return True
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(arg.split())
if __name__ == '__main__':
turtle_thread = TurtleDeviceThread()
turtle_thread.start()
NoBlockingTurtleShell(turtle_thread).cmdloop()