[issue26571] turtle regression in 3.5

[William Navaraj]

William Navaraj  added the comment:

Hi all,
Sorry. I seem to have stepped on someone's toes or no one likes turtle any more 
(as this is active since 2016). As you can see, I am new here and still getting 
a feel for these procedures. I was preparing a Jupyter notebook for my 
students. I planned some exercises with turtle at start before we jump into 
real robots. I noticed this annoying Terminator error, digged deeper into the 
code to find about the _RUNNING class variable. The PR from Furkan suggest to 
remove the Raise Terminator. May be we could amend that and I will close my PR, 
if you prefer. 

Thanks,

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[issue26571] turtle regression in 3.5

[William Navaraj]

Change by William Navaraj :


--
nosy: +williamnavaraj
nosy_count: 6.0 -> 7.0
pull_requests: +28569
pull_request: https://github.com/python/cpython/pull/30355

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[issue26571] turtle regression in 3.5

[Roundup Robot]

Change by Roundup Robot :


--
nosy: +python-dev
nosy_count: 5.0 -> 6.0
pull_requests: +28547
pull_request: https://github.com/python/cpython/pull/30332

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[issue26571] turtle regression in 3.5

[Irit Katriel]

Change by Irit Katriel :


--
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 3.5

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[issue26571] turtle regression in 3.5

[Furkan Onder]

Furkan Onder  added the comment:

PR has been sent.

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[issue26571] turtle regression in 3.5

[Furkan Onder]

Change by Furkan Onder :


--
keywords: +patch
nosy: +furkanonder
nosy_count: 4.0 -> 5.0
pull_requests: +18820
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/19465

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[issue26571] turtle regression in 3.5

[Carol Willing]

Change by Carol Willing :


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stage:  -> needs patch

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[issue26571] turtle regression in 3.5

[Robert Harder]

Robert Harder added the comment:

Thanks for pointing out the workaround.  Was driving me crazy.  Possible fix is 
to add TurtleScreen._RUNNING = True ~line 967 in turtle.py, in 
TurtleScreen.__init__ function.

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nosy: +Robert Harder

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[issue26571] turtle regression in 3.5

[Ethan Furman]

Ethan Furman added the comment:

Serhiy, is this a quick fix you can get in?

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[issue26571] turtle regression in 3.5

[Ellison Marks]

Ellison Marks added the comment:

Just as an update, I've been working around this by manually setting 
TurtleScreen._RUNNING to True before calling Turtle() again, which produces the 
desired behaviour in both 3.4 and 3.5. Haven't noticed any bad effects so far.

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[issue26571] turtle regression in 3.5

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
assignee:  -> serhiy.storchaka
nosy: +serhiy.storchaka

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[issue26571] turtle regression in 3.5

[Ethan Furman]

Changes by Ethan Furman :


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nosy: +ethan.furman

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[issue26571] turtle regression in 3.5

[Ellison Marks]

New submission from Ellison Marks:

I noticed some odd behaviour when running some turtle code I wrote using python 
3.5. A simplified example:

>>> from turtle import Turtle
>>> t = Turtle()
>>> t.getscreen().bye() # or manually close the turtle window
>>> t2 = Turtle()
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib64/python3.5/turtle.py", line 3816, in __init__
visible=visible)
  File "/usr/lib64/python3.5/turtle.py", line 2557, in __init__
self._update()
  File "/usr/lib64/python3.5/turtle.py", line 2660, in _update
self._update_data()
  File "/usr/lib64/python3.5/turtle.py", line 2646, in _update_data
self.screen._incrementudc()
  File "/usr/lib64/python3.5/turtle.py", line 1292, in _incrementudc
raise Terminator
turtle.Terminator
>>>

This code works under 3.4, opening a new turtle window the second time Turtle() 
is called. Under 3.5, a blank white window opens.

This seems to be related to https://hg.python.org/cpython/rev/1628484c9408, as 
the only point that raises Terminator is guarded by a check for `if not 
TurtleScreen._RUNNING:`

--
components: Library (Lib)
messages: 261840
nosy: Ellison Marks
priority: normal
severity: normal
status: open
title: turtle regression in 3.5
type: behavior
versions: Python 3.5

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