tkinter raises TypeError when it's supposed to raise TclError

[Akuli]

BPO	41384
Nosy	@terryjreedy, @serhiy-storchaka, @Akuli, @miss-islington
PRs	bpo-41384: fix .keys()[0] in tkinter #21601 [3.9] bpo-41384: Raise TclError in tkinter.OptionMenu (GH-21601) #21635 [3.8] bpo-41384: Raise TclError in tkinter.OptionMenu (GH-21601) #21636

^{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 = None
closed_at = <Date 2020-07-27.02:17:20.765>
created_at = <Date 2020-07-24.14:48:31.142>
labels = ['3.8', 'type-bug', 'expert-tkinter', '3.9', '3.10']
title = "tkinter raises TypeError when it's supposed to raise TclError"
updated_at = <Date 2020-07-27.02:17:20.764>
user = 'https://github.com/Akuli'

bugs.python.org fields:

activity = <Date 2020-07-27.02:17:20.764>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2020-07-27.02:17:20.765>
closer = 'terry.reedy'
components = ['Tkinter']
creation = <Date 2020-07-24.14:48:31.142>
creator = 'Akuli'
dependencies = []
files = []
hgrepos = []
issue_num = 41384
keywords = ['patch']
message_count = 5.0
messages = ['374188', '374351', '374355', '374356', '374357']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'gpolo', 'serhiy.storchaka', 'Akuli', 'miss-islington']
pr_nums = ['21601', '21635', '21636']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41384'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[Akuli]

from Lib:tkinter/init.py:

raise TclError('unknown option -'+kwargs.keys()[0])

This is no longer valid in Python 3.

[terryjreedy]

New changeset f1d40f9 by Akuli in branch 'master':
bpo-41384: Raise TclError in tkinter.OptionMenu (GH-21601)
f1d40f9

[terryjreedy]

New changeset 8b05275 by Miss Islington (bot) in branch '3.9':
bpo-41384: Raise TclError in tkinter.OptionMenu (GH-21601)
8b05275

[terryjreedy]

New changeset 104aded by Miss Islington (bot) in branch '3.8':
bpo-41384: Raise TclError in tkinter.OptionMenu (GH-21601)
104aded

[terryjreedy]

Thank you for reporting this. In the future, you can suggest a fix on the issue, without a PR.