python类tz()的实例源码

def in_words_from_now(stamp, sep='_', precision='{:0.1f}'):
    if stamp is None:
        return 'never'
    nw = now()
    if nw > stamp:
        words = ('ago',)
        rdate = delta(nw, stamp)
    else:
        words = ('from', 'now')
        rdate = delta(stamp, nw)
    if rdate.days > 0 or rdate.weeks > 0 or rdate.months > 0 or rdate.years > 0:
        return stamp.astimezone(dateutil.tz.tzlocal()).isoformat()
    if rdate.hours > 0:
        value = rdate.hours + (rdate.minutes / 60.0)
        label = 'hours'
    elif rdate.minutes > 0:
        value = rdate.minutes + (rdate.seconds / 60.0)
        label = 'min'
    else:
        value = rdate.seconds + (rdate.microseconds / 1000000.0)
        label = 'sec'
    return sep.join((precision.format(value), label) + words)

def datetime_from_timestamp(ts, tz=None, as_utc=False):
    # type: (float, dateutil.tz, bool) -> datetime.datetime
    """Convert a timestamp into datetime with offset
    :param float ts: timestamp
    :param dateutil.tz tz: time zone or local tz if not specified
    :param bool as_utc: convert datetime to UTC
    :rtype: datetime.datetime
    :return: converted timestamp to datetime
    """
    if tz is None:
        tz = dateutil.tz.tzlocal()
    dt = datetime.datetime.fromtimestamp(ts, tz=tz)
    if as_utc:
        return dt.astimezone(tz=dateutil.tz.tzutc())
    else:
        return dt

def test_index_convert_to_datetime_array(self):
        tm._skip_if_no_pytz()

        def _check_rng(rng):
            converted = rng.to_pydatetime()
            tm.assertIsInstance(converted, np.ndarray)
            for x, stamp in zip(converted, rng):
                tm.assertIsInstance(x, datetime)
                self.assertEqual(x, stamp.to_pydatetime())
                self.assertEqual(x.tzinfo, stamp.tzinfo)

        rng = date_range('20090415', '20090519')
        rng_eastern = date_range('20090415', '20090519', tz='US/Eastern')
        rng_utc = date_range('20090415', '20090519', tz='utc')

        _check_rng(rng)
        _check_rng(rng_eastern)
        _check_rng(rng_utc)

def test_index_convert_to_datetime_array_explicit_pytz(self):
        tm._skip_if_no_pytz()
        import pytz

        def _check_rng(rng):
            converted = rng.to_pydatetime()
            tm.assertIsInstance(converted, np.ndarray)
            for x, stamp in zip(converted, rng):
                tm.assertIsInstance(x, datetime)
                self.assertEqual(x, stamp.to_pydatetime())
                self.assertEqual(x.tzinfo, stamp.tzinfo)

        rng = date_range('20090415', '20090519')
        rng_eastern = date_range('20090415', '20090519',
                                 tz=pytz.timezone('US/Eastern'))
        rng_utc = date_range('20090415', '20090519', tz=pytz.utc)

        _check_rng(rng)
        _check_rng(rng_eastern)
        _check_rng(rng_utc)

def test_index_convert_to_datetime_array_dateutil(self):
        tm._skip_if_no_dateutil()
        import dateutil

        def _check_rng(rng):
            converted = rng.to_pydatetime()
            tm.assertIsInstance(converted, np.ndarray)
            for x, stamp in zip(converted, rng):
                tm.assertIsInstance(x, datetime)
                self.assertEqual(x, stamp.to_pydatetime())
                self.assertEqual(x.tzinfo, stamp.tzinfo)

        rng = date_range('20090415', '20090519')
        rng_eastern = date_range('20090415', '20090519',
                                 tz='dateutil/US/Eastern')
        rng_utc = date_range('20090415', '20090519', tz=dateutil.tz.tzutc())

        _check_rng(rng)
        _check_rng(rng_eastern)
        _check_rng(rng_utc)

def test_dti_constructor_years_only(self):
        # GH 6961
        for tz in [None, 'UTC', 'Asia/Tokyo', 'dateutil/US/Pacific']:
            rng1 = date_range('2014', '2015', freq='M', tz=tz)
            expected1 = date_range('2014-01-31', '2014-12-31', freq='M', tz=tz)

            rng2 = date_range('2014', '2015', freq='MS', tz=tz)
            expected2 = date_range('2014-01-01', '2015-01-01', freq='MS',
                                   tz=tz)

            rng3 = date_range('2014', '2020', freq='A', tz=tz)
            expected3 = date_range('2014-12-31', '2019-12-31', freq='A', tz=tz)

            rng4 = date_range('2014', '2020', freq='AS', tz=tz)
            expected4 = date_range('2014-01-01', '2020-01-01', freq='AS',
                                   tz=tz)

            for rng, expected in [(rng1, expected1), (rng2, expected2),
                                  (rng3, expected3), (rng4, expected4)]:
                tm.assert_index_equal(rng, expected)

def test_append_concat_tz(self):
        # GH 2938
        tm._skip_if_no_pytz()

        rng = date_range('5/8/2012 1:45', periods=10, freq='5T',
                         tz='US/Eastern')
        rng2 = date_range('5/8/2012 2:35', periods=10, freq='5T',
                          tz='US/Eastern')
        rng3 = date_range('5/8/2012 1:45', periods=20, freq='5T',
                          tz='US/Eastern')
        ts = Series(np.random.randn(len(rng)), rng)
        df = DataFrame(np.random.randn(len(rng), 4), index=rng)
        ts2 = Series(np.random.randn(len(rng2)), rng2)
        df2 = DataFrame(np.random.randn(len(rng2), 4), index=rng2)

        result = ts.append(ts2)
        result_df = df.append(df2)
        self.assertTrue(result.index.equals(rng3))
        self.assertTrue(result_df.index.equals(rng3))

        appended = rng.append(rng2)
        self.assertTrue(appended.equals(rng3))

def test_append_concat_tz_explicit_pytz(self):
        # GH 2938
        tm._skip_if_no_pytz()
        from pytz import timezone as timezone

        rng = date_range('5/8/2012 1:45', periods=10, freq='5T',
                         tz=timezone('US/Eastern'))
        rng2 = date_range('5/8/2012 2:35', periods=10, freq='5T',
                          tz=timezone('US/Eastern'))
        rng3 = date_range('5/8/2012 1:45', periods=20, freq='5T',
                          tz=timezone('US/Eastern'))
        ts = Series(np.random.randn(len(rng)), rng)
        df = DataFrame(np.random.randn(len(rng), 4), index=rng)
        ts2 = Series(np.random.randn(len(rng2)), rng2)
        df2 = DataFrame(np.random.randn(len(rng2), 4), index=rng2)

        result = ts.append(ts2)
        result_df = df.append(df2)
        self.assertTrue(result.index.equals(rng3))
        self.assertTrue(result_df.index.equals(rng3))

        appended = rng.append(rng2)
        self.assertTrue(appended.equals(rng3))

def test_period_resample_with_local_timezone_dateutil(self):
        # GH5430
        tm._skip_if_no_dateutil()
        import dateutil

        local_timezone = 'dateutil/America/Los_Angeles'

        start = datetime(year=2013, month=11, day=1, hour=0, minute=0,
                         tzinfo=dateutil.tz.tzutc())
        # 1 day later
        end = datetime(year=2013, month=11, day=2, hour=0, minute=0,
                       tzinfo=dateutil.tz.tzutc())

        index = pd.date_range(start, end, freq='H')

        series = pd.Series(1, index=index)
        series = series.tz_convert(local_timezone)
        result = series.resample('D', kind='period').mean()

        # Create the expected series
        # Index is moved back a day with the timezone conversion from UTC to
        # Pacific
        expected_index = (pd.period_range(start=start, end=end, freq='D') - 1)
        expected = pd.Series(1, index=expected_index)
        assert_series_equal(result, expected)

def test_take(self):
        dates = [datetime(2010, 1, 1, 14), datetime(2010, 1, 1, 15),
                 datetime(2010, 1, 1, 17), datetime(2010, 1, 1, 21)]

        for tz in [None, 'US/Eastern', 'Asia/Tokyo']:
            idx = DatetimeIndex(start='2010-01-01 09:00',
                                end='2010-02-01 09:00', freq='H', tz=tz,
                                name='idx')
            expected = DatetimeIndex(dates, freq=None, name='idx', tz=tz)

            taken1 = idx.take([5, 6, 8, 12])
            taken2 = idx[[5, 6, 8, 12]]

            for taken in [taken1, taken2]:
                self.assertTrue(taken.equals(expected))
                tm.assertIsInstance(taken, DatetimeIndex)
                self.assertIsNone(taken.freq)
                self.assertEqual(taken.tz, expected.tz)
                self.assertEqual(taken.name, expected.name)

def test_dti_set_index_reindex(self):
        # GH 6631
        df = DataFrame(np.random.random(6))
        idx1 = date_range('2011/01/01', periods=6, freq='M', tz='US/Eastern')
        idx2 = date_range('2013', periods=6, freq='A', tz='Asia/Tokyo')

        df = df.set_index(idx1)
        self.assertTrue(df.index.equals(idx1))
        df = df.reindex(idx2)
        self.assertTrue(df.index.equals(idx2))

        # 11314
        # with tz
        index = date_range(datetime(2015, 10, 1), datetime(
            2015, 10, 1, 23), freq='H', tz='US/Eastern')
        df = DataFrame(np.random.randn(24, 1), columns=['a'], index=index)
        new_index = date_range(datetime(2015, 10, 2),
                               datetime(2015, 10, 2, 23),
                               freq='H', tz='US/Eastern')

        # TODO: unused?
        result = df.set_index(new_index)  # noqa

        self.assertEqual(new_index.freq, index.freq)

def test_cant_compare_tz_naive_w_aware(self):
        tm._skip_if_no_pytz()
        # #1404
        a = Timestamp('3/12/2012')
        b = Timestamp('3/12/2012', tz='utc')

        self.assertRaises(Exception, a.__eq__, b)
        self.assertRaises(Exception, a.__ne__, b)
        self.assertRaises(Exception, a.__lt__, b)
        self.assertRaises(Exception, a.__gt__, b)
        self.assertRaises(Exception, b.__eq__, a)
        self.assertRaises(Exception, b.__ne__, a)
        self.assertRaises(Exception, b.__lt__, a)
        self.assertRaises(Exception, b.__gt__, a)

        if sys.version_info < (3, 3):
            self.assertRaises(Exception, a.__eq__, b.to_pydatetime())
            self.assertRaises(Exception, a.to_pydatetime().__eq__, b)
        else:
            self.assertFalse(a == b.to_pydatetime())
            self.assertFalse(a.to_pydatetime() == b)

def test_cant_compare_tz_naive_w_aware_explicit_pytz(self):
        tm._skip_if_no_pytz()
        from pytz import utc
        # #1404
        a = Timestamp('3/12/2012')
        b = Timestamp('3/12/2012', tz=utc)

        self.assertRaises(Exception, a.__eq__, b)
        self.assertRaises(Exception, a.__ne__, b)
        self.assertRaises(Exception, a.__lt__, b)
        self.assertRaises(Exception, a.__gt__, b)
        self.assertRaises(Exception, b.__eq__, a)
        self.assertRaises(Exception, b.__ne__, a)
        self.assertRaises(Exception, b.__lt__, a)
        self.assertRaises(Exception, b.__gt__, a)

        if sys.version_info < (3, 3):
            self.assertRaises(Exception, a.__eq__, b.to_pydatetime())
            self.assertRaises(Exception, a.to_pydatetime().__eq__, b)
        else:
            self.assertFalse(a == b.to_pydatetime())
            self.assertFalse(a.to_pydatetime() == b)

def test_cant_compare_tz_naive_w_aware_dateutil(self):
        tm._skip_if_no_dateutil()
        from dateutil.tz import tzutc
        utc = tzutc()
        # #1404
        a = Timestamp('3/12/2012')
        b = Timestamp('3/12/2012', tz=utc)

        self.assertRaises(Exception, a.__eq__, b)
        self.assertRaises(Exception, a.__ne__, b)
        self.assertRaises(Exception, a.__lt__, b)
        self.assertRaises(Exception, a.__gt__, b)
        self.assertRaises(Exception, b.__eq__, a)
        self.assertRaises(Exception, b.__ne__, a)
        self.assertRaises(Exception, b.__lt__, a)
        self.assertRaises(Exception, b.__gt__, a)

        if sys.version_info < (3, 3):
            self.assertRaises(Exception, a.__eq__, b.to_pydatetime())
            self.assertRaises(Exception, a.to_pydatetime().__eq__, b)
        else:
            self.assertFalse(a == b.to_pydatetime())
            self.assertFalse(a.to_pydatetime() == b)

def test_tz_localize_dti(self):
        dti = DatetimeIndex(start='1/1/2005', end='1/1/2005 0:00:30.256',
                            freq='L')
        dti2 = dti.tz_localize(self.tzstr('US/Eastern'))

        dti_utc = DatetimeIndex(start='1/1/2005 05:00',
                                end='1/1/2005 5:00:30.256', freq='L', tz='utc')

        self.assert_numpy_array_equal(dti2.values, dti_utc.values)

        dti3 = dti2.tz_convert(self.tzstr('US/Pacific'))
        self.assert_numpy_array_equal(dti3.values, dti_utc.values)

        dti = DatetimeIndex(start='11/6/2011 1:59', end='11/6/2011 2:00',
                            freq='L')
        self.assertRaises(pytz.AmbiguousTimeError, dti.tz_localize,
                          self.tzstr('US/Eastern'))

        dti = DatetimeIndex(start='3/13/2011 1:59', end='3/13/2011 2:00',
                            freq='L')
        self.assertRaises(pytz.NonExistentTimeError, dti.tz_localize,
                          self.tzstr('US/Eastern'))

def test_utc_box_timestamp_and_localize(self):
        rng = date_range('3/11/2012', '3/12/2012', freq='H', tz='utc')
        rng_eastern = rng.tz_convert(self.tzstr('US/Eastern'))

        tz = self.tz('US/Eastern')
        expected = rng[-1].astimezone(tz)

        stamp = rng_eastern[-1]
        self.assertEqual(stamp, expected)
        self.assertEqual(stamp.tzinfo, expected.tzinfo)

        # right tzinfo
        rng = date_range('3/13/2012', '3/14/2012', freq='H', tz='utc')
        rng_eastern = rng.tz_convert(self.tzstr('US/Eastern'))
        # test not valid for dateutil timezones.
        # self.assertIn('EDT', repr(rng_eastern[0].tzinfo))
        self.assertTrue('EDT' in repr(rng_eastern[0].tzinfo) or 'tzfile' in
                        repr(rng_eastern[0].tzinfo))

def test_with_tz_ambiguous_times(self):
        tz = self.tz('US/Eastern')

        # March 13, 2011, spring forward, skip from 2 AM to 3 AM
        dr = date_range(datetime(2011, 3, 13, 1, 30), periods=3,
                        freq=datetools.Hour())
        self.assertRaises(pytz.NonExistentTimeError, dr.tz_localize, tz)

        # after dst transition, it works
        dr = date_range(datetime(2011, 3, 13, 3, 30), periods=3,
                        freq=datetools.Hour(), tz=tz)

        # November 6, 2011, fall back, repeat 2 AM hour
        dr = date_range(datetime(2011, 11, 6, 1, 30), periods=3,
                        freq=datetools.Hour())
        self.assertRaises(pytz.AmbiguousTimeError, dr.tz_localize, tz)

        # UTC is OK
        dr = date_range(datetime(2011, 3, 13), periods=48,
                        freq=datetools.Minute(30), tz=pytz.utc)

def test_infer_tz(self):
        eastern = self.tz('US/Eastern')
        utc = pytz.utc

        _start = datetime(2001, 1, 1)
        _end = datetime(2009, 1, 1)

        start = self.localize(eastern, _start)
        end = self.localize(eastern, _end)
        assert (tools._infer_tzinfo(start, end) is self.localize(
            eastern, _start).tzinfo)
        assert (tools._infer_tzinfo(start, None) is self.localize(
            eastern, _start).tzinfo)
        assert (tools._infer_tzinfo(None, end) is self.localize(eastern,
                                                                _end).tzinfo)

        start = utc.localize(_start)
        end = utc.localize(_end)
        assert (tools._infer_tzinfo(start, end) is utc)

        end = self.localize(eastern, _end)
        self.assertRaises(Exception, tools._infer_tzinfo, start, end)
        self.assertRaises(Exception, tools._infer_tzinfo, end, start)

def test_index_astype_asobject_tzinfos(self):
        # #1345

        # dates around a dst transition
        rng = date_range('2/13/2010', '5/6/2010', tz=self.tzstr('US/Eastern'))

        objs = rng.asobject
        for i, x in enumerate(objs):
            exval = rng[i]
            self.assertEqual(x, exval)
            self.assertEqual(x.tzinfo, exval.tzinfo)

        objs = rng.astype(object)
        for i, x in enumerate(objs):
            exval = rng[i]
            self.assertEqual(x, exval)
            self.assertEqual(x.tzinfo, exval.tzinfo)

def test_localized_at_time_between_time(self):
        from datetime import time

        rng = date_range('4/16/2012', '5/1/2012', freq='H')
        ts = Series(np.random.randn(len(rng)), index=rng)

        ts_local = ts.tz_localize(self.tzstr('US/Eastern'))

        result = ts_local.at_time(time(10, 0))
        expected = ts.at_time(time(10, 0)).tz_localize(self.tzstr(
            'US/Eastern'))
        tm.assert_series_equal(result, expected)
        self.assertTrue(self.cmptz(result.index.tz, self.tz('US/Eastern')))

        t1, t2 = time(10, 0), time(11, 0)
        result = ts_local.between_time(t1, t2)
        expected = ts.between_time(t1,
                                   t2).tz_localize(self.tzstr('US/Eastern'))
        tm.assert_series_equal(result, expected)
        self.assertTrue(self.cmptz(result.index.tz, self.tz('US/Eastern')))

def test_series_frame_tz_localize(self):

        rng = date_range('1/1/2011', periods=100, freq='H')
        ts = Series(1, index=rng)

        result = ts.tz_localize('utc')
        self.assertEqual(result.index.tz.zone, 'UTC')

        df = DataFrame({'a': 1}, index=rng)
        result = df.tz_localize('utc')
        expected = DataFrame({'a': 1}, rng.tz_localize('UTC'))
        self.assertEqual(result.index.tz.zone, 'UTC')
        assert_frame_equal(result, expected)

        df = df.T
        result = df.tz_localize('utc', axis=1)
        self.assertEqual(result.columns.tz.zone, 'UTC')
        assert_frame_equal(result, expected.T)

        # Can't localize if already tz-aware
        rng = date_range('1/1/2011', periods=100, freq='H', tz='utc')
        ts = Series(1, index=rng)
        tm.assertRaisesRegexp(TypeError, 'Already tz-aware', ts.tz_localize,
                              'US/Eastern')

def test_series_frame_tz_convert(self):
        rng = date_range('1/1/2011', periods=200, freq='D', tz='US/Eastern')
        ts = Series(1, index=rng)

        result = ts.tz_convert('Europe/Berlin')
        self.assertEqual(result.index.tz.zone, 'Europe/Berlin')

        df = DataFrame({'a': 1}, index=rng)
        result = df.tz_convert('Europe/Berlin')
        expected = DataFrame({'a': 1}, rng.tz_convert('Europe/Berlin'))
        self.assertEqual(result.index.tz.zone, 'Europe/Berlin')
        assert_frame_equal(result, expected)

        df = df.T
        result = df.tz_convert('Europe/Berlin', axis=1)
        self.assertEqual(result.columns.tz.zone, 'Europe/Berlin')
        assert_frame_equal(result, expected.T)

        # can't convert tz-naive
        rng = date_range('1/1/2011', periods=200, freq='D')
        ts = Series(1, index=rng)
        tm.assertRaisesRegexp(TypeError, "Cannot convert tz-naive",
                              ts.tz_convert, 'US/Eastern')

def test_append_aware_naive(self):
        rng1 = date_range('1/1/2011 01:00', periods=1, freq='H')
        rng2 = date_range('1/1/2011 02:00', periods=1, freq='H',
                          tz='US/Eastern')
        ts1 = Series(np.random.randn(len(rng1)), index=rng1)
        ts2 = Series(np.random.randn(len(rng2)), index=rng2)
        ts_result = ts1.append(ts2)
        self.assertTrue(ts_result.index.equals(ts1.index.asobject.append(
            ts2.index.asobject)))

        # mixed

        rng1 = date_range('1/1/2011 01:00', periods=1, freq='H')
        rng2 = lrange(100)
        ts1 = Series(np.random.randn(len(rng1)), index=rng1)
        ts2 = Series(np.random.randn(len(rng2)), index=rng2)
        ts_result = ts1.append(ts2)
        self.assertTrue(ts_result.index.equals(ts1.index.asobject.append(
            ts2.index)))

def test_equal_join_ensure_utc(self):
        rng = date_range('1/1/2011', periods=10, freq='H', tz='US/Eastern')
        ts = Series(np.random.randn(len(rng)), index=rng)

        ts_moscow = ts.tz_convert('Europe/Moscow')

        result = ts + ts_moscow
        self.assertIs(result.index.tz, pytz.utc)

        result = ts_moscow + ts
        self.assertIs(result.index.tz, pytz.utc)

        df = DataFrame({'a': ts})
        df_moscow = df.tz_convert('Europe/Moscow')
        result = df + df_moscow
        self.assertIs(result.index.tz, pytz.utc)

        result = df_moscow + df
        self.assertIs(result.index.tz, pytz.utc)

def test_arith_utc_convert(self):
        rng = date_range('1/1/2011', periods=100, freq='H', tz='utc')

        perm = np.random.permutation(100)[:90]
        ts1 = Series(np.random.randn(90),
                     index=rng.take(perm).tz_convert('US/Eastern'))

        perm = np.random.permutation(100)[:90]
        ts2 = Series(np.random.randn(90),
                     index=rng.take(perm).tz_convert('Europe/Berlin'))

        result = ts1 + ts2

        uts1 = ts1.tz_convert('utc')
        uts2 = ts2.tz_convert('utc')
        expected = uts1 + uts2

        self.assertEqual(result.index.tz, pytz.UTC)
        tm.assert_series_equal(result, expected)

def test_tzaware_offset(self):
        dates = date_range('2012-11-01', periods=3, tz='US/Pacific')
        offset = dates + offsets.Hour(5)
        self.assertEqual(dates[0] + offsets.Hour(5), offset[0])

        # GH 6818
        for tz in ['UTC', 'US/Pacific', 'Asia/Tokyo']:
            dates = date_range('2010-11-01 00:00', periods=3, tz=tz, freq='H')
            expected = DatetimeIndex(['2010-11-01 05:00', '2010-11-01 06:00',
                                      '2010-11-01 07:00'], freq='H', tz=tz)

            offset = dates + offsets.Hour(5)
            self.assertTrue(offset.equals(expected))
            offset = dates + np.timedelta64(5, 'h')
            self.assertTrue(offset.equals(expected))
            offset = dates + timedelta(hours=5)
            self.assertTrue(offset.equals(expected))

def create_curtailment_publish(self, current_time_str, device_name, meta):
        try:
            headers = {
                "Date": current_time_str,
                "min_compatible_version": "3.0",
                "MessageType": "Control"
            }
            subdevices = self.curtailment.get_device(device_name).command_status.keys()

            for subdevice in subdevices:
                currently_curtailed = self.curtailment.get_device(device_name).currently_curtailed[subdevice]
                curtailment_topic = "/".join([self.update_base_topic, device_name[0], subdevice])
                curtailment_status = "Active" if currently_curtailed else "Inactive"
                curtailment_message = [
                    {
                        "DeviceState": curtailment_status
                    },
                    {
                        "DeviceState": {"tz": "US/Pacific", "type": "string"}
                    }
                ]
                self.vip.pubsub.publish('pubsub', curtailment_topic, headers=headers, message=curtailment_message).get(timeout=15.0)
        except:
            _log.debug("Unable to publish device/subdevice curtailment status message.")

def test_vtimezone_creation(self):
        tzs = dateutil.tz.tzical("test_files/timezones.ics")
        pacific = icalendar.TimezoneComponent(tzs.get('US/Pacific'))
        self.assertEqual(
            str(pacific),
            "<VTIMEZONE | <TZID{}US/Pacific>>"
        )
        santiago = icalendar.TimezoneComponent(tzs.get('Santiago'))
        self.assertEqual(
            str(santiago),
            "<VTIMEZONE | <TZID{}Santiago>>"
        )
        for year in range(2001, 2010):
            for month in (2, 9):
                dt = datetime.datetime(year, month, 15, tzinfo = tzs.get('Santiago'))
                #if dt.replace(tzinfo=tzs.get('Santiago')) != dt:
                self.assertTrue(dt.replace(tzinfo=tzs.get('Santiago')), dt)

def test_scratchbuild(self):
        """
        CreateCalendar 2.0 format from scratch
        """
        test_cal = get_test_file("simple_2_0_test.ics")
        cal = base.newFromBehavior('vcalendar', '2.0')
        cal.add('vevent')
        cal.vevent.add('dtstart').value = datetime.datetime(2006, 5, 9)
        cal.vevent.add('description').value = "Test event"
        cal.vevent.add('created').value = \
            datetime.datetime(2006, 1, 1, 10,
                              tzinfo=dateutil.tz.tzical(
                                  "test_files/timezones.ics").get('US/Pacific'))
        cal.vevent.add('uid').value = "Not very random UID"
        cal.vevent.add('dtstamp').value = datetime.datetime(2017, 6, 26, 0, tzinfo=tzutc())

        # Note we're normalizing line endings, because no one got time for that.
        self.assertEqual(
            cal.serialize().replace('\r\n', '\n'),
            test_cal.replace('\r\n', '\n')
        )

def test_vtimezone_creation(self):
        """
        Test timezones
        """
        tzs = dateutil.tz.tzical("test_files/timezones.ics")
        pacific = icalendar.TimezoneComponent(tzs.get('US/Pacific'))
        self.assertEqual(
            str(pacific),
            "<VTIMEZONE | <TZID{}US/Pacific>>"
        )
        santiago = icalendar.TimezoneComponent(tzs.get('Santiago'))
        self.assertEqual(
            str(santiago),
            "<VTIMEZONE | <TZID{}Santiago>>"
        )
        for year in range(2001, 2010):
            for month in (2, 9):
                dt = datetime.datetime(year, month, 15,
                                       tzinfo=tzs.get('Santiago'))
                self.assertTrue(dt.replace(tzinfo=tzs.get('Santiago')), dt)