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GeezerVison is showing github.com — [3.12] gh-112938: IDLE - Fix uninteruptable hang when Shell gets rapid continuous output. (GH-124310) by miss-islington · Pull Request #124319 · python/cpython

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@miss-islington

@miss-islington miss-islington commented Sep 22, 2024 •
edited by bedevere-app Bot
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#88496 replaced text.update with text.update_idletasks in colorizer.py and outwin.py to fix test failures on macOS. While theoretically correct, the result was Shell freezing when receiving continuous short strings to print. Test: while 1: 1.

The guess is that there is no idle time in which to do the screen update. Reverting the change in one of the files,
outwin, fixes the issue. Colorizer runs ever 1/20 second and seems to work fine.

When running test-outwin on macOS, alias 'update'
to 'update_idletasks on the text used for testing.
(cherry picked from commit d5f95ec)

Co-authored-by: Terry Jan Reedy [email protected]

  • Issue: IDLE: infinite print loop hangs and crashes #112938

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@terryjreedy @miss-islington
pythongh-112938: IDLE - Fix uninteruptable hang when Shell gets rapid…
a0a40e0
… continuous output. (pythonGH-124310)

python#88496 replaced text.update with text.update_idletasks in colorizer.py and outwin.py to fix test failures on macOS.  While theoretically correct, the result was Shell freezing when receiving continuous short strings to print.  Test: `while 1: 1`.

The guess is that there is no idle time in which to do the screen update.  Reverting the change in one of the files,
outwin, fixes the issue.  Colorizer runs ever 1/20 second and seems to work fine.

When running test-outwin on macOS, alias 'update'
to 'update_idletasks on the text used for testing.
(cherry picked from commit d5f95ec)

Co-authored-by: Terry Jan Reedy <[email protected]>
@miss-islington
miss-islington requested a review from terryjreedy as a code owner September 22, 2024 19:51
@bedevere-app bedevere-app Bot added awaiting review topic-IDLE labels Sep 22, 2024
This was referenced Sep 22, 2024
gh-112938: IDLE - Fix uninteruptable hang when Shell gets rapid continuous output. #124310
Merged
IDLE: infinite print loop hangs and crashes #112938
Closed
@terryjreedy
terryjreedy enabled auto-merge (squash) September 22, 2024 19:55
@terryjreedy
terryjreedy merged commit cf39a5f into python:3.12 Sep 22, 2024
@bedevere-app bedevere-app Bot removed the awaiting review label Sep 22, 2024
@miss-islington
miss-islington deleted the backport-d5f95ec-3.12 branch January 2, 2026 18:46
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@terryjreedy terryjreedy Awaiting requested review from terryjreedy terryjreedy is a code owner

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@miss-islington @terryjreedy
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