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gh-121782: Remove deprecated %Z directive in strftime-related tests #135200

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@CharlieZhao95 CharlieZhao95 commented Jun 6, 2025

The %Z in time.strftime is a platform-specific directive. It causes strftime to return no characters on some platforms, which makes tests unstable.

But fortunately the %Z in time.strftime is deprecated, so we can remove it from those tests safely.

%Z: Time zone name (no characters if no time zone exists). Deprecated.

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@StanFromIreland StanFromIreland left a comment

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Just because it is deprecated does not mean it should be removed. It is not even hard deprecated IIRC?

The next should probably be hard-deprecating it for 3.16 IMO, then removing it.

Are these tests not affected?
./Lib/test/test_strptime.py:        timezone = time.strftime("%Z", self.time_tuple).lower()
./Lib/test/test_strptime.py:        self.assertEqual(_strptime.TimeRE(test_locale).pattern("%Z"), '',
./Lib/test/test_strptime.py:                         "with timezone == ('',''), TimeRE().pattern('%Z') != ''")
./Lib/test/test_strptime.py:        self.assertTrue(time_re.compile("%Z").match("Tokyo (standard time)"),
./Lib/test/test_strptime.py:        # When gmtime() is used with %Z, entire result of strftime() is empty.
./Lib/test/test_strptime.py:        strp_output = _strptime._strptime_time("UTC", "%Z")
./Lib/test/test_strptime.py:        strp_output = _strptime._strptime_time("GMT", "%Z")
./Lib/test/test_strptime.py:        strf_output = time.strftime("%Z")  #UTC does not have a timezone
./Lib/test/test_strptime.py:        strp_output = _strptime._strptime_time(strf_output, "%Z")
./Lib/test/test_strptime.py:            tz_value = _strptime._strptime_time(tz_name, "%Z")[8]
./Lib/test/test_strptime.py:        format_string = "%Y %m %d %H %M %S %w %Z"
./Lib/test/test_strptime.py:        format_string = "%Y %H %M %S %w %j %Z"
./Lib/test/test_strptime.py:        format_string = "%Y %m %d %H %S %j %Z"
./Lib/test/test_strptime.py:        tm = _strptime._strptime_time(time.tzname[0], '%Z')
./Lib/test/test_strptime.py:        tm = _strptime._strptime_time(time.tzname[1], '%Z')
./Lib/test/test_strptime.py:        tm = _strptime._strptime_time(time.tzname[0], '%Z')
./Lib/test/test_strptime.py:        tm = _strptime._strptime_time(time.tzname[1], '%Z')
./Lib/test/test_strptime.py:            _strptime._strptime_time(oldtzname[0], '%Z')
./Lib/test/test_strptime.py:            _strptime._strptime_time(oldtzname[1], '%Z')
./Lib/test/datetimetester.py:        # A naive object replaces %z, %:z and %Z w/ empty strings.
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime("'%z' '%:z' '%Z'"), "'' '' ''")
./Lib/test/datetimetester.py:                    "%z %:z %Z",
./Lib/test/datetimetester.py:                    "%z %:z %Z",
./Lib/test/datetimetester.py:        self.assertRaises(TypeError, t.strftime, '%Z')
./Lib/test/datetimetester.py:            dt = strptime(dtstr, "%z %Z")
./Lib/test/datetimetester.py:        dtstr, fmt = "+1234 UTC", "%z %Z"
./Lib/test/datetimetester.py:        self.assertEqual(strptime("UTC", "%Z").tzinfo, None)
./Lib/test/datetimetester.py:        # A naive object replaces %z, %:z and %Z with empty strings.
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime("'%z' '%:z' '%Z'"), "'' '' ''")
./Lib/test/datetimetester.py:        s1 = t.strftime('%I%p%Z')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('\U0001f4bb%I%p%Z\U0001f40d%X'), f'\U0001f4bb{s1}\U0001f40d{s2}')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('%I%p%Z\U0001f4bb%X\U0001f40d'), f'{s1}\U0001f4bb{s2}\U0001f40d')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('\ud83d%I%p%Z\udc0d%X'), f'\ud83d{s1}\udc0d{s2}')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('%I%p%Z\ud83d%X\udc0d'), f'{s1}\ud83d{s2}\udc0d')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('%I%p%Z\udc0d%X\ud83d'), f'{s1}\udc0d{s2}\ud83d')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('%I%p%Z\ud83d\udc0d%X'), f'{s1}\ud83d\udc0d{s2}')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('%I%p%Z\udcf0\udc9f\udc90\udc8d%X'), f'{s1}\udcf0\udc9f\udc90\udc8d{s2}')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('\0%I%p%Z\0%X'), f'\0{s1}\0{s2}')
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime('%I%p%Z\0%X\0'), f'{s1}\0{s2}\0')
./Lib/test/datetimetester.py:                t = strptime(tstr, "%z %Z")
./Lib/test/datetimetester.py:        tstr, fmt = "+1234 UTC", "%z %Z"
./Lib/test/datetimetester.py:        self.assertEqual(strptime("UTC", "%Z").tzinfo, None)
./Lib/test/datetimetester.py:        self.assertEqual(t1.strftime("%H:%M:%S %%Z=%Z %%z=%z %%:z=%:z"),
./Lib/test/datetimetester.py:                                     "07:47:00 %Z=EST %z=-0500 %:z=-05:00")
./Lib/test/datetimetester.py:        self.assertEqual(t2.strftime("%H:%M:%S %Z %z %:z"), "12:47:00 UTC +0000 +00:00")
./Lib/test/datetimetester.py:        self.assertEqual(t3.strftime("%H:%M:%S %Z %z %:z"), "13:47:00 MET +0100 +01:00")
./Lib/test/datetimetester.py:        yuck = FixedOffset(-1439, "%z %Z %%z%%Z")
./Lib/test/datetimetester.py:        self.assertEqual(t1.strftime("%H:%M %%Z='%Z' %%z='%z'"),
./Lib/test/datetimetester.py:                                     "23:59 %Z='%z %Z %%z%%Z' %z='-2359'")
./Lib/test/datetimetester.py:        self.assertRaises(TypeError, t.strftime, "%Z")
./Lib/test/datetimetester.py:        self.assertEqual(t.strftime("%Z"), '\ud800')
./Lib/test/datetimetester.py:        self.assertEqual(local.strftime("%z %Z"), "-0500 EST")
./Lib/test/datetimetester.py:        self.assertEqual(local.strftime("%z %Z"), "-0400 EDT")
./Lib/test/datetimetester.py:        self.assertEqual(ldt.strftime("%c %Z%z"),
./Lib/test/datetimetester.py:        self.assertEqual(ldt.strftime("%c %Z%z"),
./Lib/test/datetimetester.py:        self.assertEqual(ldt.strftime("%c %Z%z"),
./Lib/test/datetimetester.py:        self.assertEqual(gdt.strftime("%c %Z"),
./Lib/test/datetimetester.py:        self.assertEqual(gdt.strftime("%c %Z"),
./Lib/test/datetimetester.py:        self.assertEqual(gdt.strftime("%c %Z"),
./Lib/test/datetimetester.py:        self.assertEqual(gdt.strftime("%c %Z"),
./Lib/test/datetimetester.py:        if _time.strftime('%Z%z', tm) != 'LHST+1030':
./Lib/test/datetimetester.py:        if _time.strftime('%Z%z', tm) != 'LHST+1030':
./Lib/test/test_strftime.py:            # %Z see below
./Lib/test/test_strftime.py:            ('%Z', '%s' % self.tz, 'time zone name'),
./Lib/test/test_time.py:        tzname = time.strftime('%Z', tt)
./Lib/test/test_time.py:        self.assertEqual(time.strftime('%Z', tt), tzname)
./Lib/test/test_time.py:        t = time.strptime("UTC", "%Z")

cc @encukou

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