[ python-Bugs-1702036 ] Turtle isn't thread-safe (crashes)

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Bugs item #1702036, was opened at 2007-04-17 08:29
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Category: Python Library
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: lomm (korka)
Assigned to: Nobody/Anonymous (nobody)
Summary: Turtle isn't thread-safe (crashes)

Initial Comment:
These are a few examples of errors during code-reentry in the turtle module:

System tested: Windows XP sp2, Python 2.5

1. turtle.circle fails if the tkinter is closed while drawing.

# Code example:
import turtle
turtle.circle(100)
# close the tkinter window while the circle is drawing
# will give an "invalid command name" exception



2. using multiple inheritance, it's possible to draw more than 1 turtle running around at a time. This works part of the time, but crashes python completely on occasions.

# Code example:
import turtle, random
from threading import Thread

class Ninja(Thread, turtle.Turtle):
	'A ninja is a threaded turtle'
	
	def __init__(self):
		# constructors
		Thread.__init__(self)
		turtle.Turtle.__init__(self)
		
		# where will i go?
		self.Direction = random.randint(-180,180)
	
	def run(self):
		# that way!
		self.left(self.Direction)
		
		# march 'forward'
		for i in range(50):
			self.forward(16*random.random())
			self.left(22 - 45*random.random())




ninjas = []
for i in range(3):
	ninjas.append(Ninja())
	ninjas[-1].start()


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