IDLE: "Unrecoverable server exiting" message

[albertpython]

BPO	41468
Nosy	@terryjreedy, @vstinner, @miss-islington, @E-Paine
PRs	bpo-41468: Improve and test IDLE run error exit  #21798 [3.9] bpo-41468: Improve and test IDLE run error exit (GH-21798) #21800 [3.8] bpo-41468: Improve and test IDLE run error exit (GH-21798) #21801

^{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/terryjreedy'
closed_at = <Date 2020-08-10.00:41:08.978>
created_at = <Date 2020-08-03.23:03:19.424>
labels = ['expert-IDLE', 'type-bug', '3.10']
title = 'IDLE: "Unrecoverable server exiting" message'
updated_at = <Date 2021-09-27.17:03:18.470>
user = 'https://bugs.python.org/albertpython'

bugs.python.org fields:

activity = <Date 2021-09-27.17:03:18.470>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2020-08-10.00:41:08.978>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2020-08-03.23:03:19.424>
creator = 'albertpython'
dependencies = []
files = []
hgrepos = []
issue_num = 41468
keywords = ['patch']
message_count = 11.0
messages = ['374766', '374796', '374799', '374803', '374804', '375079', '375080', '375081', '375107', '375113', '375161']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'vstinner', 'miss-islington', 'epaine', 'albertpython']
pr_nums = ['21798', '21800', '21801']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41468'
versions = ['Python 3.10']

[albertpython]

How to solve unrecoverable server exiting in IDLE

[E-Paine]

To help us to reproduce and understand the issue, please could you give us 1) a more detailed explanation of the problem you are facing and 2) steps to reproduce the issue (maybe providing a minimal code example if that is the cause). Is this a bug with IDLE, though, as you say "solve" (which I interpret to mean you want help with your code) in which case it may be better suited to Stack Overflow?

[terryjreedy]

Start IDLE in a Terminal/Command Prompt window with python -m idlelib, where 'python` is whatever runs your most recent 3.x python. Then see if an error message shows up after IDLE exits.