Lib/test/test_typing.py failed when ran as a script

BPO	34181
Nosy	@serhiy-storchaka
PRs	bpo-34181: Fix running Lib/test/test_typing.py as a script. #8380 [3.7] bpo-34181: Fix running Lib/test/test_typing.py as a script. (GH-8380) #8385

^{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/serhiy-storchaka'
closed_at = <Date 2018-07-22.10:45:01.520>
created_at = <Date 2018-07-21.17:23:21.080>
labels = ['3.7', '3.8', 'type-bug', 'tests']
title = 'Lib/test/test_typing.py failed when ran as a script'
updated_at = <Date 2018-07-22.10:45:01.519>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-07-22.10:45:01.519>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2018-07-22.10:45:01.520>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2018-07-21.17:23:21.080>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 34181
keywords = ['patch']
message_count = 3.0
messages = ['322109', '322122', '322141']
nosy_count = 1.0
nosy_names = ['serhiy.storchaka']
pr_nums = ['8380', '8385']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34181'
versions = ['Python 3.7', 'Python 3.8']