Adding an assertClose() method to unittest.TestCase

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-06-03.18:48:32.670>
labels = ['type-feature', 'library', '3.11']
title = 'Adding an assertClose() method to unittest.TestCase'
updated_at = <Date 2022-03-21.22:57:05.453>
user = 'https://github.com/PythonCHB'

bugs.python.org fields:

activity = <Date 2022-03-21.22:57:05.453>
actor = 'ChrisBarker'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-06-03.18:48:32.670>
creator = 'ChrisBarker'
dependencies = []
files = ['43157', '43165']
hgrepos = []
issue_num = 27198
keywords = ['patch']
message_count = 23.0
messages = ['267133', '267139', '267150', '267153', '267160', '267168', '267169', '267172', '267176', '267178', '267187', '267215', '267224', '267445', '268878', '268881', '269034', '269036', '269192', '415576', '415586', '415593', '415720']
nosy_count = 12.0
nosy_names = ['rhettinger', 'gregory.p.smith', 'mark.dickinson', 'rbcollins', 'ezio.melotti', 'r.david.murray', 'michael.foord', 'berker.peksag', 'Pam.McANulty', 'veky', 'ChrisBarker', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27198'
versions = ['Python 3.11']