How to use the tzlocal.unix function in tzlocal

def test_env(self):
        tz_harare = tzlocal.unix._tz_from_env(':Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        # Some Unices allow this as well, so we must allow it:
        tz_harare = tzlocal.unix._tz_from_env('Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        local_path = os.path.split(__file__)[0]
        tz_local = tzlocal.unix._tz_from_env(':' + os.path.join(local_path, 'test_data', 'Harare'))
        self.assertEqual(tz_local.zone, 'local')
        # Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.

def test_timezone_setting(self):
        # A ZONE setting in /etc/conf.d/clock, f ex Gentoo
        local_path = os.path.split(__file__)[0]
        tz = tzlocal.unix._get_localzone(_root=os.path.join(local_path, 'test_data', 'timezone_setting'))
        self.assertEqual(tz.zone, 'Africa/Harare')

def test_vardbzoneinfo_setting(self):
        # A ZONE setting in /etc/conf.d/clock, f ex Gentoo

        tz = tzlocal.unix._get_localzone(_root=os.path.join(self.path, 'test_data', 'vardbzoneinfo'))
        self.assertEqual(tz.zone, 'Africa/Harare')

def test_env(self):
        tz_harare = tzlocal.unix._tz_from_env(':Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        # Some Unices allow this as well, so we must allow it:
        tz_harare = tzlocal.unix._tz_from_env('Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        tz_local = tzlocal.unix._tz_from_env(':' + os.path.join(self.path, 'test_data', 'Harare'))
        self.assertEqual(tz_local.zone, 'local')
        # Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.
        self.assertRaises(pytz.UnknownTimeZoneError, tzlocal.unix._tz_from_env, 'GMT+03:00')

def test_env(self):
        tz_harare = tzlocal.unix._tz_from_env(':Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        # Some Unices allow this as well, so we must allow it:
        tz_harare = tzlocal.unix._tz_from_env('Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        tz_local = tzlocal.unix._tz_from_env(
            ':' + os.path.join(self.path, 'test_data', 'Harare'))
        self.assertEqual(tz_local.zone, 'local')
        # Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.

def test_env(self):
        tz_harare = tzlocal.unix._tz_from_env(':Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        # Some Unices allow this as well, so we must allow it:
        tz_harare = tzlocal.unix._tz_from_env('Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        tz_local = tzlocal.unix._tz_from_env(':' + os.path.join(self.path, 'test_data', 'Harare'))
        self.assertEqual(tz_local.zone, 'local')
        # Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.
        self.assertRaises(pytz.UnknownTimeZoneError, tzlocal.unix._tz_from_env, 'GMT+03:00')

self.assertEqual(tz_harare.zone, 'Africa/Harare')

        tz_local = tzlocal.unix._tz_from_env(':' + os.path.join(self.path, 'test_data', 'Harare'))
        self.assertEqual(tz_local.zone, 'local')
        # Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.
        self.assertRaises(pytz.UnknownTimeZoneError, tzlocal.unix._tz_from_env, 'GMT+03:00')

        # Test the _try function
        os.environ['TZ'] = 'Africa/Harare'
        tz_harare = tzlocal.unix._try_tz_from_env()
        self.assertEqual(tz_harare.zone, 'Africa/Harare')
        # With a zone that doesn't exist
        os.environ['TZ'] = 'Just Nonsense'
        tz_harare = tzlocal.unix._try_tz_from_env()
        self.assertIsNone(tz_harare)

# Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.
        self.assertRaises(pytz.UnknownTimeZoneError, tzlocal.unix._tz_from_env, 'GMT+03:00')

        # Test the _try function
        os.environ['TZ'] = 'Africa/Harare'
        tz_harare = tzlocal.unix._try_tz_from_env()
        self.assertEqual(tz_harare.zone, 'Africa/Harare')
        # With a zone that doesn't exist
        os.environ['TZ'] = 'Just Nonsense'
        tz_harare = tzlocal.unix._try_tz_from_env()
        self.assertIsNone(tz_harare)

def test_env(self):
        tz_harare = tzlocal.unix._tz_from_env(':Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        # Some Unices allow this as well, so we must allow it:
        tz_harare = tzlocal.unix._tz_from_env('Africa/Harare')
        self.assertEqual(tz_harare.zone, 'Africa/Harare')

        tz_local = tzlocal.unix._tz_from_env(':' + os.path.join(self.path, 'test_data', 'Harare'))
        self.assertEqual(tz_local.zone, 'local')
        # Make sure the local timezone is the same as the Harare one above.
        # We test this with a past date, so that we don't run into future changes
        # of the Harare timezone.
        dt = datetime(2012, 1, 1, 5)
        self.assertEqual(tz_harare.localize(dt), tz_local.localize(dt))

        # Non-zoneinfo timezones are not supported in the TZ environment.
        self.assertRaises(pytz.UnknownTimeZoneError, tzlocal.unix._tz_from_env, 'GMT+03:00')

def _get_localzone(_root='/'):
    tzenv = tzlocal.unix._try_tz_from_env()
    if tzenv:
        return tzenv

    with Popen(
        "systemsetup -gettimezone",
        shell=True,
        stderr=subprocess.PIPE,
        stdout=subprocess.PIPE
    ) as pipe:
        tzname = pipe.stdout.read().replace(b'Time Zone: ', b'').strip()

    if not tzname or tzname not in pytz.all_timezones_set:
        # link will be something like /usr/share/zoneinfo/America/Los_Angeles.
        link = os.readlink(os.path.join(_root, "etc/localtime"))
        tzname = link[link.rfind("zoneinfo/") + 9:]