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turtle regression in 3.5 #70758

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turtle regression in 3.5#70758
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serhiy-storchaka
Labels
3.13only security fixes3.14bugs and security fixes3.15bugs and security fixes3.16new features, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

@gotyaoi
gotyaoi
mannequin
opened on Mar 16, 2016
BPO 26571
Nosy @ethanfurman, @serhiy-storchaka, @gotyaoi, @furkanonder, @williamnavaraj
PRs
  • bpo-26571: fix Turtle Terminator Exception #19465
  • bpo-26571-Class variable _RUNNING update at the __init__ end #30332
  • bpo-26571: Reinit class variable _RUNNING #30355
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/serhiy-storchaka'
closed_at = None
created_at = <Date 2016-03-16.04:59:15.427>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'turtle regression in 3.5'
updated_at = <Date 2022-01-06.15:52:29.164>
user = 'https://github.com/gotyaoi'

    bugs.python.org fields:

    activity = <Date 2022-01-06.15:52:29.164>
actor = 'williamnavaraj'
assignee = 'serhiy.storchaka'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-03-16.04:59:15.427>
creator = 'Ellison Marks'
dependencies = []
files = []
hgrepos = []
issue_num = 26571
keywords = ['patch']
message_count = 6.0
messages = ['261840', '263589', '273190', '279343', '366212', '409866']
nosy_count = 7.0
nosy_names = ['ethan.furman', 'python-dev', 'serhiy.storchaka', 'Ellison Marks', 'Robert Harder', 'furkanonder', 'williamnavaraj']
pr_nums = ['19465', '30332', '30355']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue26571'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

    Linked PRs

    Activity

    1. gotyaoi commented on Mar 16, 2016

      @gotyaoi
      gotyaoimannequin
      on Mar 16, 2016
      MannequinAuthor

      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 "<stdin>", line 1, in <module>
  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:`

    2. gotyaoi
      added
      stdlibStandard Library Python modules in the Lib/ directory
      type-bugAn unexpected behavior, bug, or error
      on Mar 16, 2016
    3. serhiy-storchaka
      self-assigned this
      on Mar 16, 2016

    4. gotyaoi commented on Apr 16, 2016

      @gotyaoi
      gotyaoimannequin
      on Apr 16, 2016
      MannequinAuthor

      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.

    5. ethanfurman commented on Aug 20, 2016

      @ethanfurman
      ethanfurman
      on Aug 20, 2016
      Member

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

    6. RobertHarder commented on Oct 24, 2016

      @RobertHarder
      RobertHardermannequin
      on Oct 24, 2016
      Mannequin

      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.

    7. furkanonder commented on Apr 11, 2020

      @furkanonder
      furkanondermannequin
      on Apr 11, 2020
      Mannequin

      PR has been sent.

    8. iritkatriel
      added
      3.9 (EOL)end of life
      3.10 (EOL)end of life
      3.11only security fixes
      on Dec 11, 2021

    9. williamnavaraj commented on Jan 6, 2022

      @williamnavaraj
      williamnavarajmannequin
      on Jan 6, 2022
      Mannequin

      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,

    10. ezio-melotti
      transferred this issue fromon Apr 10, 2022
    11. serhiy-storchaka
      added this to Turtle issues 🐢on May 21, 2022
    12. serhiy-storchaka
      added
      3.13only security fixes
      3.14bugs and security fixes
      3.15bugs and security fixes
      3.16new features, bugs and security fixes
      and removed
      3.9 (EOL)end of life
      3.10 (EOL)end of life
      3.11only security fixes
      on Aug 9, 2026
    13. serhiy-storchaka
      added 3 commits that reference this issue on Aug 9, 2026

      gh-70758: Fix creating a turtle screen after closing one (GH-30355)

      1286d43

      [3.13] gh-70758: Fix creating a turtle screen after closing one (GH-3…

      4d92c53

      [3.14] gh-70758: Fix creating a turtle screen after closing one (GH-3…

      518f743
    14. serhiy-storchaka
      closed this as completedon Aug 10, 2026
    15. github-project-automation
      moved this to Done in Turtle issues 🐢on Aug 10, 2026
    16. mbeijen
      added a commit that references this issue on Aug 14, 2026

      pythongh-70758: Fix creating a turtle screen after closing one (pytho…

      9672a21
    17. serhiy-storchaka
      added a commit that references this issue on Oct 10, 2026

      [3.15] gh-70758: Fix creating a turtle screen after closing one (GH-3…

      6c577a5
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