Tkinter Turtles und Fäden
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27-10-2019 - |
Frage
Welt! In Turtle Graphics in Python besteht möglich, verschiedene Schildkrötenobjekte zu erstellen und sie mit ihren Methoden zu manipulieren, vorwärts, rückwärts ... Ich wollte mit Threads experimentieren, also schrieb ich eine Thread -Klasse namens 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()
Mit dem Experiment erwartete ich, dass sich alle Schildkröten "gleichzeitig" und zufällig bewegen, aber wenn ich das Programm ausführe, bekomme ich folgende Fehler:
<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
Was bedeutet das, was "Hauptfaden nicht in der Hauptschleife" bedeutet. Danke für Ihre Hilfe.
Lösung
Dies scheint eine Python/Tkinter -Einschränkung zu sein wie hier beschrieben, Schildkröte und Fäden sind keine Freunde
Andere Tipps
Dies hat seine Einschränkungen, kann aber immer noch möglich sein. Die Antwort liegt in Ihrem Fehler durch.
RuntimeError: Hauptfaden befindet sich nicht in der Hauptschleife
Beschränken Sie Ihre Turtle/Tkinter -Operationen auf den Hauptfaden. In meiner Nacharbeit Ihres Beispiels unten habe ich den Thread sicher verwendet Warteschlange Datenstruktur, um zwischen den Fäden und der Schildkröte zu kommunizieren:
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()
Ich habe die Queue_size auf 1 gesetzt, da ich auf einer Maschine mit nur zwei Threads bin! Ich bin gespannt, ob alles richtig auf einer Maschine mit mehr Threads und einer Queue_size ~ = #threads - 1 funktioniert - 1