projektAI/venv/Lib/site-packages/pandas/tests/scalar/timestamp/test_timestamp.py
2021-06-06 22:13:05 +02:00

576 lines
20 KiB
Python

""" test the scalar Timestamp """
import calendar
from datetime import datetime, timedelta
import locale
import unicodedata
from dateutil.tz import tzutc
import numpy as np
import pytest
import pytz
from pytz import timezone, utc
from pandas._libs.tslibs.timezones import dateutil_gettz as gettz, get_timezone
from pandas.compat.numpy import np_datetime64_compat
import pandas.util._test_decorators as td
from pandas import NaT, Timedelta, Timestamp
import pandas._testing as tm
from pandas.tseries import offsets
class TestTimestampProperties:
def test_properties_business(self):
ts = Timestamp("2017-10-01", freq="B")
control = Timestamp("2017-10-01")
assert ts.dayofweek == 6
assert ts.day_of_week == 6
assert not ts.is_month_start # not a weekday
assert not ts.is_quarter_start # not a weekday
# Control case: non-business is month/qtr start
assert control.is_month_start
assert control.is_quarter_start
ts = Timestamp("2017-09-30", freq="B")
control = Timestamp("2017-09-30")
assert ts.dayofweek == 5
assert ts.day_of_week == 5
assert not ts.is_month_end # not a weekday
assert not ts.is_quarter_end # not a weekday
# Control case: non-business is month/qtr start
assert control.is_month_end
assert control.is_quarter_end
def test_fields(self):
def check(value, equal):
# that we are int like
assert isinstance(value, int)
assert value == equal
# GH 10050
ts = Timestamp("2015-05-10 09:06:03.000100001")
check(ts.year, 2015)
check(ts.month, 5)
check(ts.day, 10)
check(ts.hour, 9)
check(ts.minute, 6)
check(ts.second, 3)
msg = "'Timestamp' object has no attribute 'millisecond'"
with pytest.raises(AttributeError, match=msg):
ts.millisecond
check(ts.microsecond, 100)
check(ts.nanosecond, 1)
check(ts.dayofweek, 6)
check(ts.day_of_week, 6)
check(ts.quarter, 2)
check(ts.dayofyear, 130)
check(ts.day_of_year, 130)
check(ts.week, 19)
check(ts.daysinmonth, 31)
check(ts.daysinmonth, 31)
# GH 13303
ts = Timestamp("2014-12-31 23:59:00-05:00", tz="US/Eastern")
check(ts.year, 2014)
check(ts.month, 12)
check(ts.day, 31)
check(ts.hour, 23)
check(ts.minute, 59)
check(ts.second, 0)
msg = "'Timestamp' object has no attribute 'millisecond'"
with pytest.raises(AttributeError, match=msg):
ts.millisecond
check(ts.microsecond, 0)
check(ts.nanosecond, 0)
check(ts.dayofweek, 2)
check(ts.day_of_week, 2)
check(ts.quarter, 4)
check(ts.dayofyear, 365)
check(ts.day_of_year, 365)
check(ts.week, 1)
check(ts.daysinmonth, 31)
ts = Timestamp("2014-01-01 00:00:00+01:00")
starts = ["is_month_start", "is_quarter_start", "is_year_start"]
for start in starts:
assert getattr(ts, start)
ts = Timestamp("2014-12-31 23:59:59+01:00")
ends = ["is_month_end", "is_year_end", "is_quarter_end"]
for end in ends:
assert getattr(ts, end)
# GH 12806
@pytest.mark.parametrize(
"data",
[Timestamp("2017-08-28 23:00:00"), Timestamp("2017-08-28 23:00:00", tz="EST")],
)
@pytest.mark.parametrize(
"time_locale", [None] if tm.get_locales() is None else [None] + tm.get_locales()
)
def test_names(self, data, time_locale):
# GH 17354
# Test .day_name(), .month_name
if time_locale is None:
expected_day = "Monday"
expected_month = "August"
else:
with tm.set_locale(time_locale, locale.LC_TIME):
expected_day = calendar.day_name[0].capitalize()
expected_month = calendar.month_name[8].capitalize()
result_day = data.day_name(time_locale)
result_month = data.month_name(time_locale)
# Work around https://github.com/pandas-dev/pandas/issues/22342
# different normalizations
expected_day = unicodedata.normalize("NFD", expected_day)
expected_month = unicodedata.normalize("NFD", expected_month)
result_day = unicodedata.normalize("NFD", result_day)
result_month = unicodedata.normalize("NFD", result_month)
assert result_day == expected_day
assert result_month == expected_month
# Test NaT
nan_ts = Timestamp(NaT)
assert np.isnan(nan_ts.day_name(time_locale))
assert np.isnan(nan_ts.month_name(time_locale))
def test_is_leap_year(self, tz_naive_fixture):
tz = tz_naive_fixture
# GH 13727
dt = Timestamp("2000-01-01 00:00:00", tz=tz)
assert dt.is_leap_year
assert isinstance(dt.is_leap_year, bool)
dt = Timestamp("1999-01-01 00:00:00", tz=tz)
assert not dt.is_leap_year
dt = Timestamp("2004-01-01 00:00:00", tz=tz)
assert dt.is_leap_year
dt = Timestamp("2100-01-01 00:00:00", tz=tz)
assert not dt.is_leap_year
def test_woy_boundary(self):
# make sure weeks at year boundaries are correct
d = datetime(2013, 12, 31)
result = Timestamp(d).week
expected = 1 # ISO standard
assert result == expected
d = datetime(2008, 12, 28)
result = Timestamp(d).week
expected = 52 # ISO standard
assert result == expected
d = datetime(2009, 12, 31)
result = Timestamp(d).week
expected = 53 # ISO standard
assert result == expected
d = datetime(2010, 1, 1)
result = Timestamp(d).week
expected = 53 # ISO standard
assert result == expected
d = datetime(2010, 1, 3)
result = Timestamp(d).week
expected = 53 # ISO standard
assert result == expected
result = np.array(
[
Timestamp(datetime(*args)).week
for args in [(2000, 1, 1), (2000, 1, 2), (2005, 1, 1), (2005, 1, 2)]
]
)
assert (result == [52, 52, 53, 53]).all()
def test_resolution(self):
# GH#21336, GH#21365
dt = Timestamp("2100-01-01 00:00:00")
assert dt.resolution == Timedelta(nanoseconds=1)
# Check that the attribute is available on the class, mirroring
# the stdlib datetime behavior
assert Timestamp.resolution == Timedelta(nanoseconds=1)
class TestTimestamp:
def test_tz(self):
tstr = "2014-02-01 09:00"
ts = Timestamp(tstr)
local = ts.tz_localize("Asia/Tokyo")
assert local.hour == 9
assert local == Timestamp(tstr, tz="Asia/Tokyo")
conv = local.tz_convert("US/Eastern")
assert conv == Timestamp("2014-01-31 19:00", tz="US/Eastern")
assert conv.hour == 19
# preserves nanosecond
ts = Timestamp(tstr) + offsets.Nano(5)
local = ts.tz_localize("Asia/Tokyo")
assert local.hour == 9
assert local.nanosecond == 5
conv = local.tz_convert("US/Eastern")
assert conv.nanosecond == 5
assert conv.hour == 19
def test_utc_z_designator(self):
assert get_timezone(Timestamp("2014-11-02 01:00Z").tzinfo) is utc
def test_asm8(self):
np.random.seed(7_960_929)
ns = [Timestamp.min.value, Timestamp.max.value, 1000]
for n in ns:
assert (
Timestamp(n).asm8.view("i8") == np.datetime64(n, "ns").view("i8") == n
)
assert Timestamp("nat").asm8.view("i8") == np.datetime64("nat", "ns").view("i8")
def test_class_ops_pytz(self):
def compare(x, y):
assert int((Timestamp(x).value - Timestamp(y).value) / 1e9) == 0
compare(Timestamp.now(), datetime.now())
compare(Timestamp.now("UTC"), datetime.now(timezone("UTC")))
compare(Timestamp.utcnow(), datetime.utcnow())
compare(Timestamp.today(), datetime.today())
current_time = calendar.timegm(datetime.now().utctimetuple())
compare(
Timestamp.utcfromtimestamp(current_time),
datetime.utcfromtimestamp(current_time),
)
compare(
Timestamp.fromtimestamp(current_time), datetime.fromtimestamp(current_time)
)
date_component = datetime.utcnow()
time_component = (date_component + timedelta(minutes=10)).time()
compare(
Timestamp.combine(date_component, time_component),
datetime.combine(date_component, time_component),
)
def test_class_ops_dateutil(self):
def compare(x, y):
assert (
int(
np.round(Timestamp(x).value / 1e9)
- np.round(Timestamp(y).value / 1e9)
)
== 0
)
compare(Timestamp.now(), datetime.now())
compare(Timestamp.now("UTC"), datetime.now(tzutc()))
compare(Timestamp.utcnow(), datetime.utcnow())
compare(Timestamp.today(), datetime.today())
current_time = calendar.timegm(datetime.now().utctimetuple())
compare(
Timestamp.utcfromtimestamp(current_time),
datetime.utcfromtimestamp(current_time),
)
compare(
Timestamp.fromtimestamp(current_time), datetime.fromtimestamp(current_time)
)
date_component = datetime.utcnow()
time_component = (date_component + timedelta(minutes=10)).time()
compare(
Timestamp.combine(date_component, time_component),
datetime.combine(date_component, time_component),
)
def test_basics_nanos(self):
val = np.int64(946_684_800_000_000_000).view("M8[ns]")
stamp = Timestamp(val.view("i8") + 500)
assert stamp.year == 2000
assert stamp.month == 1
assert stamp.microsecond == 0
assert stamp.nanosecond == 500
# GH 14415
val = np.iinfo(np.int64).min + 80_000_000_000_000
stamp = Timestamp(val)
assert stamp.year == 1677
assert stamp.month == 9
assert stamp.day == 21
assert stamp.microsecond == 145224
assert stamp.nanosecond == 192
@pytest.mark.parametrize(
"value, check_kwargs",
[
[946688461000000000, {}],
[946688461000000000 / 1000, {"unit": "us"}],
[946688461000000000 / 1_000_000, {"unit": "ms"}],
[946688461000000000 / 1_000_000_000, {"unit": "s"}],
[10957, {"unit": "D", "h": 0}],
[
(946688461000000000 + 500000) / 1000000000,
{"unit": "s", "us": 499, "ns": 964},
],
[
(946688461000000000 + 500000000) / 1000000000,
{"unit": "s", "us": 500000},
],
[(946688461000000000 + 500000) / 1000000, {"unit": "ms", "us": 500}],
[(946688461000000000 + 500000) / 1000, {"unit": "us", "us": 500}],
[(946688461000000000 + 500000000) / 1000000, {"unit": "ms", "us": 500000}],
[946688461000000000 / 1000.0 + 5, {"unit": "us", "us": 5}],
[946688461000000000 / 1000.0 + 5000, {"unit": "us", "us": 5000}],
[946688461000000000 / 1000000.0 + 0.5, {"unit": "ms", "us": 500}],
[946688461000000000 / 1000000.0 + 0.005, {"unit": "ms", "us": 5, "ns": 5}],
[946688461000000000 / 1000000000.0 + 0.5, {"unit": "s", "us": 500000}],
[10957 + 0.5, {"unit": "D", "h": 12}],
],
)
def test_unit(self, value, check_kwargs):
def check(value, unit=None, h=1, s=1, us=0, ns=0):
stamp = Timestamp(value, unit=unit)
assert stamp.year == 2000
assert stamp.month == 1
assert stamp.day == 1
assert stamp.hour == h
if unit != "D":
assert stamp.minute == 1
assert stamp.second == s
assert stamp.microsecond == us
else:
assert stamp.minute == 0
assert stamp.second == 0
assert stamp.microsecond == 0
assert stamp.nanosecond == ns
check(value, **check_kwargs)
def test_roundtrip(self):
# test value to string and back conversions
# further test accessors
base = Timestamp("20140101 00:00:00")
result = Timestamp(base.value + Timedelta("5ms").value)
assert result == Timestamp(f"{base}.005000")
assert result.microsecond == 5000
result = Timestamp(base.value + Timedelta("5us").value)
assert result == Timestamp(f"{base}.000005")
assert result.microsecond == 5
result = Timestamp(base.value + Timedelta("5ns").value)
assert result == Timestamp(f"{base}.000000005")
assert result.nanosecond == 5
assert result.microsecond == 0
result = Timestamp(base.value + Timedelta("6ms 5us").value)
assert result == Timestamp(f"{base}.006005")
assert result.microsecond == 5 + 6 * 1000
result = Timestamp(base.value + Timedelta("200ms 5us").value)
assert result == Timestamp(f"{base}.200005")
assert result.microsecond == 5 + 200 * 1000
def test_hash_equivalent(self):
d = {datetime(2011, 1, 1): 5}
stamp = Timestamp(datetime(2011, 1, 1))
assert d[stamp] == 5
def test_tz_conversion_freq(self, tz_naive_fixture):
# GH25241
t1 = Timestamp("2019-01-01 10:00", freq="H")
assert t1.tz_localize(tz=tz_naive_fixture).freq == t1.freq
t2 = Timestamp("2019-01-02 12:00", tz="UTC", freq="T")
assert t2.tz_convert(tz="UTC").freq == t2.freq
class TestTimestampNsOperations:
def test_nanosecond_string_parsing(self):
ts = Timestamp("2013-05-01 07:15:45.123456789")
# GH 7878
expected_repr = "2013-05-01 07:15:45.123456789"
expected_value = 1_367_392_545_123_456_789
assert ts.value == expected_value
assert expected_repr in repr(ts)
ts = Timestamp("2013-05-01 07:15:45.123456789+09:00", tz="Asia/Tokyo")
assert ts.value == expected_value - 9 * 3600 * 1_000_000_000
assert expected_repr in repr(ts)
ts = Timestamp("2013-05-01 07:15:45.123456789", tz="UTC")
assert ts.value == expected_value
assert expected_repr in repr(ts)
ts = Timestamp("2013-05-01 07:15:45.123456789", tz="US/Eastern")
assert ts.value == expected_value + 4 * 3600 * 1_000_000_000
assert expected_repr in repr(ts)
# GH 10041
ts = Timestamp("20130501T071545.123456789")
assert ts.value == expected_value
assert expected_repr in repr(ts)
def test_nanosecond_timestamp(self):
# GH 7610
expected = 1_293_840_000_000_000_005
t = Timestamp("2011-01-01") + offsets.Nano(5)
assert repr(t) == "Timestamp('2011-01-01 00:00:00.000000005')"
assert t.value == expected
assert t.nanosecond == 5
t = Timestamp(t)
assert repr(t) == "Timestamp('2011-01-01 00:00:00.000000005')"
assert t.value == expected
assert t.nanosecond == 5
t = Timestamp(np_datetime64_compat("2011-01-01 00:00:00.000000005Z"))
assert repr(t) == "Timestamp('2011-01-01 00:00:00.000000005')"
assert t.value == expected
assert t.nanosecond == 5
expected = 1_293_840_000_000_000_010
t = t + offsets.Nano(5)
assert repr(t) == "Timestamp('2011-01-01 00:00:00.000000010')"
assert t.value == expected
assert t.nanosecond == 10
t = Timestamp(t)
assert repr(t) == "Timestamp('2011-01-01 00:00:00.000000010')"
assert t.value == expected
assert t.nanosecond == 10
t = Timestamp(np_datetime64_compat("2011-01-01 00:00:00.000000010Z"))
assert repr(t) == "Timestamp('2011-01-01 00:00:00.000000010')"
assert t.value == expected
assert t.nanosecond == 10
class TestTimestampToJulianDate:
def test_compare_1700(self):
r = Timestamp("1700-06-23").to_julian_date()
assert r == 2_342_145.5
def test_compare_2000(self):
r = Timestamp("2000-04-12").to_julian_date()
assert r == 2_451_646.5
def test_compare_2100(self):
r = Timestamp("2100-08-12").to_julian_date()
assert r == 2_488_292.5
def test_compare_hour01(self):
r = Timestamp("2000-08-12T01:00:00").to_julian_date()
assert r == 2_451_768.5416666666666666
def test_compare_hour13(self):
r = Timestamp("2000-08-12T13:00:00").to_julian_date()
assert r == 2_451_769.0416666666666666
class TestTimestampConversion:
def test_conversion(self):
# GH#9255
ts = Timestamp("2000-01-01")
result = ts.to_pydatetime()
expected = datetime(2000, 1, 1)
assert result == expected
assert type(result) == type(expected)
result = ts.to_datetime64()
expected = np.datetime64(ts.value, "ns")
assert result == expected
assert type(result) == type(expected)
assert result.dtype == expected.dtype
def test_to_pydatetime_nonzero_nano(self):
ts = Timestamp("2011-01-01 9:00:00.123456789")
# Warn the user of data loss (nanoseconds).
with tm.assert_produces_warning(UserWarning, check_stacklevel=False):
expected = datetime(2011, 1, 1, 9, 0, 0, 123456)
result = ts.to_pydatetime()
assert result == expected
def test_timestamp_to_datetime(self):
stamp = Timestamp("20090415", tz="US/Eastern", freq="D")
dtval = stamp.to_pydatetime()
assert stamp == dtval
assert stamp.tzinfo == dtval.tzinfo
def test_timestamp_to_datetime_dateutil(self):
stamp = Timestamp("20090415", tz="dateutil/US/Eastern", freq="D")
dtval = stamp.to_pydatetime()
assert stamp == dtval
assert stamp.tzinfo == dtval.tzinfo
def test_timestamp_to_datetime_explicit_pytz(self):
stamp = Timestamp("20090415", tz=pytz.timezone("US/Eastern"), freq="D")
dtval = stamp.to_pydatetime()
assert stamp == dtval
assert stamp.tzinfo == dtval.tzinfo
@td.skip_if_windows_python_3
def test_timestamp_to_datetime_explicit_dateutil(self):
stamp = Timestamp("20090415", tz=gettz("US/Eastern"), freq="D")
dtval = stamp.to_pydatetime()
assert stamp == dtval
assert stamp.tzinfo == dtval.tzinfo
def test_to_datetime_bijective(self):
# Ensure that converting to datetime and back only loses precision
# by going from nanoseconds to microseconds.
exp_warning = None if Timestamp.max.nanosecond == 0 else UserWarning
with tm.assert_produces_warning(exp_warning, check_stacklevel=False):
assert (
Timestamp(Timestamp.max.to_pydatetime()).value / 1000
== Timestamp.max.value / 1000
)
exp_warning = None if Timestamp.min.nanosecond == 0 else UserWarning
with tm.assert_produces_warning(exp_warning, check_stacklevel=False):
assert (
Timestamp(Timestamp.min.to_pydatetime()).value / 1000
== Timestamp.min.value / 1000
)
def test_to_period_tz_warning(self):
# GH#21333 make sure a warning is issued when timezone
# info is lost
ts = Timestamp("2009-04-15 16:17:18", tz="US/Eastern")
with tm.assert_produces_warning(UserWarning):
# warning that timezone info will be lost
ts.to_period("D")
def test_to_numpy_alias(self):
# GH 24653: alias .to_numpy() for scalars
ts = Timestamp(datetime.now())
assert ts.to_datetime64() == ts.to_numpy()
class SubDatetime(datetime):
pass
@pytest.mark.parametrize(
"lh,rh",
[
(SubDatetime(2000, 1, 1), Timedelta(hours=1)),
(Timedelta(hours=1), SubDatetime(2000, 1, 1)),
],
)
def test_dt_subclass_add_timedelta(lh, rh):
# GH#25851
# ensure that subclassed datetime works for
# Timedelta operations
result = lh + rh
expected = SubDatetime(2000, 1, 1, 1)
assert result == expected