[easy] test_cmd_line: DeprecationWarning: invalid escape sequence \u

[vstinner]

BPO	43839
Nosy	@vstinner, @shreyanavigyan
Superseder	bpo-43825: Deprecation warnings in test_cmd_line and test_collections

^{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 2021-04-14.11:32:03.593>
created_at = <Date 2021-04-14.10:59:49.327>
labels = ['easy', 'tests', '3.10']
title = '[easy] test_cmd_line: DeprecationWarning: invalid escape sequence \\u'
updated_at = <Date 2021-04-14.11:32:03.593>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2021-04-14.11:32:03.593>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-14.11:32:03.593>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2021-04-14.10:59:49.327>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 43839
keywords = ['easy', 'newcomer friendly']
message_count = 1.0
messages = ['391053']
nosy_count = 2.0
nosy_names = ['vstinner', 'shreyanavigyan']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '43825'
type = None
url = 'https://bugs.python.org/issue43839'
versions = ['Python 3.10']

[vstinner]

Does someone want to propose a fix for the following warning?

$ ./python -m test test_cmd_line
0:00:00 load avg: 6.45 Run tests sequentially
0:00:00 load avg: 6.45 [1/1] test_cmd_line
/home/vstinner/python/master/Lib/test/test_cmd_line.py:865: DeprecationWarning: invalid escape sequence \u
  self.check_string(b"'\u1f'")

== Tests result: SUCCESS ==

1 test OK.

Total duration: 15.9 sec
Tests result: SUCCESS