IDLE not saving .py files

[nicklupe13]

BPO	41329
Nosy	@terryjreedy, @nicklupe13
Superseder	bpo-41300: IDLE: add missing import io in iomenu.py

^{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 2020-07-17.22:00:59.927>
created_at = <Date 2020-07-17.20:30:19.188>
labels = ['expert-IDLE', 'type-bug', '3.8']
title = 'IDLE not saving .py files'
updated_at = <Date 2020-07-17.22:45:05.546>
user = 'https://github.com/nicklupe13'

bugs.python.org fields:

activity = <Date 2020-07-17.22:45:05.546>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2020-07-17.22:00:59.927>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2020-07-17.20:30:19.188>
creator = 'nicklupe13'
dependencies = []
files = []
hgrepos = []
issue_num = 41329
keywords = []
message_count = 3.0
messages = ['373854', '373858', '373859']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'nicklupe13']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '41300'
type = 'behavior'
url = 'https://bugs.python.org/issue41329'
versions = ['Python 3.8']

[nicklupe13]

IDLE will not save .py files. Neither Ctrl + S nor file -> Save file nor file -> Save file as function as intended and the .py file is not updated.
This happens for both 32 bit and 64 bit distributions on multiple computers with 4 GB of ram running on a AMD A6-9220e RADEON R4. Tested installation in multiple locations.
IDLE will not write to file anywhere in the file system including documents, desktop, and the installation folder itself.

[terryjreedy]

Add 'import io' to the top of <pythondir>/Lib/idlelib/iomenu.py.

[terryjreedy]

In calling this a duplicate, and suggesting the fix above, I am assuming that a) you are using the new 3.8.4 and b) you have a non-ascii character in the .py file or files you tested. Since several years ago, the is the only case of save failing that I know of. If either is not the case, please reopen and report exact os, python version, minimal file that does not save, and any other possibly relevant details you can think of.