Tartarughe e fili tkinter
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27-10-2019 - |
Domanda
mondo! Nella grafica delle tartarughe a Python, è possibile creare vari oggetti di tartaruga e manipolarli con i loro metodi, in avanti, all'indietro ... Volevo sperimentare con fili, quindi ho scritto una classe fitta chiamata MyTurtleManipulator.
from threading import Thread
from cTurtle import Turtle
import random
class MyTurtleManipulator(Thread):
def __init__(self, turtle):
Thread.__init__(self)
self.turtle=turtle
def run(self):
actions=[Turtle.forward, Turtle.right, Turtle.left]
while True:
action=random.choice(actions)
action(self.turtle, random.randint(1,25))
turtles=[Turtle() for i in range(5)]
threads=[MyTurtleManipulator(turtle) for turtle in turtles]
for thread in threads:
print(thread)
thread.start()
Con l'esperimento mi aspettavo di vedere tutte le tartarughe che si muovono "contemporaneamente" e in modo casuale, ma quando eseguo il programma ottengo questi errori:
<MyTurtleManipulator(Thread-1, initial)>
<MyTurtleManipulator(Thread-2, initial)>
<MyTurtleManipulator(Thread-3, initial)>
<MyTurtleManipulator(Thread-4, initial)>
<MyTurtleManipulator(Thread-5, initial)>
>>> Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
self.run()
File "/home/rfrm/test.py", line 13, in run
action(self.turtle, random.randint(1,25))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1162, in forward
checkargs((int, float))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1131, in _go
ende = self._position + self._orient * distance
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2266, in _goto
(start, self._position),
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 419, in _drawline
cl.append(-y)
File "<string>", line 1, in coords
File "/usr/lib/python3.1/tkinter/__init__.py", line 2123, in coords
self.tk.call((self._w, 'coords') + args)))
RuntimeError: main thread is not in main loop
Exception in thread Thread-2:
Traceback (most recent call last):
File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
self.run()
File "/home/rfrm/test.py", line 13, in run
action(self.turtle, random.randint(1,25))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1203, in right
checkargs((int, float))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2300, in _rotate
self._orient = self._orient.rotate(delta)
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2085, in _update
for t in screen._turtles:
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2219, in _drawturtle
screen._drawpoly(titem, shape, fill=fc, outline=oc,
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 384, in _drawpoly
cl.append(-y)
File "<string>", line 1, in coords
File "/usr/lib/python3.1/tkinter/__init__.py", line 2123, in coords
self.tk.call((self._w, 'coords') + args)))
RuntimeError: main thread is not in main loop
Exception in thread Thread-3:
Traceback (most recent call last):
File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
self.run()
File "/home/rfrm/test.py", line 13, in run
action(self.turtle, random.randint(1,25))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1162, in forward
checkargs((int, float))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1131, in _go
ende = self._position + self._orient * distance
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2270, in _goto
screen._drawline(self.drawingLineItem, ((0, 0), (0, 0)),
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 419, in _drawline
cl.append(-y)
File "<string>", line 1, in coords
File "/usr/lib/python3.1/tkinter/__init__.py", line 2123, in coords
self.tk.call((self._w, 'coords') + args)))
RuntimeError: main thread is not in main loop
Exception in thread Thread-4:
Traceback (most recent call last):
File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
self.run()
File "/home/rfrm/test.py", line 13, in run
action(self.turtle, random.randint(1,25))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1162, in forward
checkargs((int, float))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1131, in _go
ende = self._position + self._orient * distance
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2270, in _goto
screen._drawline(self.drawingLineItem, ((0, 0), (0, 0)),
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 419, in _drawline
cl.append(-y)
File "<string>", line 1, in coords
File "/usr/lib/python3.1/tkinter/__init__.py", line 2123, in coords
self.tk.call((self._w, 'coords') + args)))
RuntimeError: main thread is not in main loop
Exception in thread Thread-5:
Traceback (most recent call last):
File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
self.run()
File "/home/rfrm/test.py", line 13, in run
action(self.turtle, random.randint(1,25))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 1203, in right
checkargs((int, float))
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2300, in _rotate
self._orient = self._orient.rotate(delta)
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2085, in _update
for t in screen._turtles:
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 2219, in _drawturtle
screen._drawpoly(titem, shape, fill=fc, outline=oc,
File "/usr/local/lib/python3.1/dist-packages/cTurtle.py", line 384, in _drawpoly
cl.append(-y)
File "<string>", line 1, in coords
File "/usr/lib/python3.1/tkinter/__init__.py", line 2123, in coords
self.tk.call((self._w, 'coords') + args)))
RuntimeError: main thread is not in main loop
Cosa significa questo, cosa significa "thread principale non è nel ciclo principale". Grazie per l'aiuto.
Soluzione
Questa sembra essere una limitazione di Python/Tkinter Come descritto qui, Tartaruga e thread non sono amici
Altri suggerimenti
Questo ha i suoi limiti ma potrebbe essere ancora possibile. La risposta è nei tuoi errore di errore:
RuntimeError: il thread principale non è in loop principale
Limitare le operazioni di tartaruga/tkinter al thread principale. Nella mia rielaborazione del tuo esempio di seguito, ho usato il thread sicuro coda Struttura dei dati per comunicare tra i thread e la tartaruga:
from threading import Thread, active_count
from turtle import Turtle, Screen
import queue
import random
QUEUE_SIZE = 1 # set higher the more hardware threads you have
ACTIONS = [Turtle.forward, Turtle.right, Turtle.left]
COLORS = ['red', 'black', 'blue', 'green', 'magenta']
class MyTurtleManipulator(Thread):
def __init__(self, turtle):
super().__init__()
self.turtle = turtle
def run(self):
for _ in range(100):
actions.put((self.turtle, random.choice(ACTIONS), random.randint(1, 30)))
def process_queue():
while not actions.empty():
turtle, action, argument = actions.get()
action(turtle, argument)
if active_count() > 1:
screen.ontimer(process_queue, 100)
actions = queue.Queue(QUEUE_SIZE)
for color in COLORS:
turtle = Turtle('turtle')
turtle.color(color)
turtle.setheading(random.randint(0, 360))
MyTurtleManipulator(turtle).start()
screen = Screen()
process_queue()
screen.mainloop()
Ho impostato il queue_size su 1 perché sono su una macchina con solo due thread! Sono curioso di sapere se tutto funziona correttamente su una macchina con più thread e una coda_size ~ = #Threads - 1