[easy] test_signal: test_pidfd_send_signal() uses deprecated assertRaisesRegexp() method

[vstinner]

BPO	39424
Nosy	@vstinner, @serhiy-storchaka, @hakancelik96
PRs	bpo-39424: Fix the call method. #18277

^{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 2020-01-30.10:27:59.879>
created_at = <Date 2020-01-22.16:56:21.303>
labels = ['easy', 'tests', '3.9']
title = '[easy] test_signal: test_pidfd_send_signal() uses deprecated assertRaisesRegexp() method'
updated_at = <Date 2020-01-30.11:59:24.444>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-01-30.11:59:24.444>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-30.10:27:59.879>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2020-01-22.16:56:21.303>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39424
keywords = ['patch', 'newcomer friendly']
message_count = 4.0
messages = ['360486', '360787', '361032', '361047']
nosy_count = 3.0
nosy_names = ['vstinner', 'serhiy.storchaka', 'hakancelik']
pr_nums = ['18277']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39424'
versions = ['Python 3.9']

[vstinner]

test_signal.test_pidfd_send_signal() should use assertRaisesRegex() rather than assertRaisesRegexp():

$ ./python -Werror -m test -v test_signal -m test_pidfd_send_signal 
(...)

======================================================================
ERROR: test_pidfd_send_signal (test.test_signal.PidfdSignalTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/vstinner/python/master/Lib/test/test_signal.py", line 1292, in test_pidfd_send_signal
    with self.assertRaisesRegexp(TypeError, "^siginfo must be None$"):
  File "/home/vstinner/python/master/Lib/unittest/case.py", line 1390, in deprecated_func
    warnings.warn(
DeprecationWarning: Please use assertRaisesRegex instead.

[hakancelik96]

I want to work on this as my first contribution

[serhiy-storchaka]

New changeset 38c878b by damani42 in branch 'master':
bpo-39424: Use assertRaisesRegex instead of assertRaisesRegexp. (GH-18277)
38c878b

[vstinner]

Thanks damani42 for the fix!

Hakan: "I want to work on this as my first contribution"

I'm sorry for you, damani42 was faster than you to propose a PR! You can look for other "newcomer friendly" issues on the bug tracker by searching per keyword.