Logging cache not cleared properly when setting level

DavidWang

BPO	37258
Nosy	@vsajip, @tirkarthi
PRs	bpo-37258: Not a bug, but added a unit test and updated documentation. #14229 [3.8] bpo-37258: Not a bug, but added a unit test and updated documentation. (GH-14229) #14230 [3.7] bpo-37258: Not a bug, but added a unit test and updated documentation. (GH-14229) #14231
Files	test.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/vsajip'
closed_at = <Date 2019-06-19.13:47:45.769>
created_at = <Date 2019-06-12.21:48:28.353>
labels = ['type-bug', '3.8', '3.9', 'invalid', '3.7', 'library']
title = 'Logging cache not cleared properly when setting level'
updated_at = <Date 2019-06-19.16:06:11.017>
user = 'https://bugs.python.org/DavidWang'

bugs.python.org fields:

activity = <Date 2019-06-19.16:06:11.017>
actor = 'vinay.sajip'
assignee = 'vinay.sajip'
closed = True
closed_date = <Date 2019-06-19.13:47:45.769>
closer = 'vinay.sajip'
components = ['Library (Lib)']
creation = <Date 2019-06-12.21:48:28.353>
creator = 'David Wang'
dependencies = []
files = ['48416']
hgrepos = []
issue_num = 37258
keywords = ['patch']
message_count = 6.0
messages = ['345414', '345490', '346036', '346037', '346046', '346047']
nosy_count = 3.0
nosy_names = ['vinay.sajip', 'xtreak', 'David Wang']
pr_nums = ['14229', '14230', '14231']
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37258'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']