backupCount is not respected in TimedRotatingFileHandler when namer is specified

[alexandersmirnoff]

BPO	44753
Nosy	@vsajip, @miss-islington
PRs	bpo-44753: Don't use logfile extension when determining old files to … #27475 [3.9] bpo-44753: Don't use logfile extension when determining old files to be deleted (GH-27475) #27486 [3.10] bpo-44753: Don't use logfile extension when determining old files to be deleted (GH-27475) #27487

^{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 2021-07-30.16:22:12.730>
created_at = <Date 2021-07-27.22:37:54.989>
labels = ['library', '3.9', '3.10']
title = 'backupCount is not respected in TimedRotatingFileHandler when namer is specified'
updated_at = <Date 2021-07-30.16:22:12.729>
user = 'https://bugs.python.org/alexandersmirnoff'

bugs.python.org fields:

activity = <Date 2021-07-30.16:22:12.729>
actor = 'vinay.sajip'
assignee = 'none'
closed = True
closed_date = <Date 2021-07-30.16:22:12.730>
closer = 'vinay.sajip'
components = ['Library (Lib)']
creation = <Date 2021-07-27.22:37:54.989>
creator = 'alexander.smirnoff'
dependencies = []
files = []
hgrepos = []
issue_num = 44753
keywords = ['patch']
message_count = 6.0
messages = ['398326', '398537', '398538', '398568', '398569', '398570']
nosy_count = 3.0
nosy_names = ['vinay.sajip', 'miss-islington', 'alexander.smirnoff']
pr_nums = ['27475', '27486', '27487']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue44753'
versions = ['Python 3.9', 'Python 3.10']

[alexandersmirnoff]

after adding namer callable (like it is described in https://bugs.python.org/issue43344) to log handler configuration, it stopped removing old files

log_filename = os.path.join(log_dir, "application.log")
log_handler = logging.handlers.TimedRotatingFileHandler(log_filename, when='MIDNIGHT', interval=1, backupCount=7)

// after adding this line, old files are not deleted
log_handler.namer = lambda name: name.replace(".log", "") + ".log"

[vsajip]

New changeset 6ff8903 by Vinay Sajip in branch 'main':
bpo-44753: Don't use logfile extension when determining old files to be deleted (GH-27475)
6ff8903

[vsajip]

Should be fixed in main, leaving open until backports are done.

[vsajip]

New changeset 882e476 by Miss Islington (bot) in branch '3.9':
bpo-44753: Don't use logfile extension when determining old files to be deleted (GH-27475) (GH-27486)
882e476

[vsajip]

New changeset 6e6dc25 by Miss Islington (bot) in branch '3.10':
bpo-44753: Don't use logfile extension when determining old files to be deleted (GH-27475) (GH-27487)
6e6dc25