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test_nat.py
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test_nat.py
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from datetime import datetime, timedelta
import numpy as np
import pytest
import pytz
from pandas._libs.tslibs import iNaT
import pandas.compat as compat
from pandas import (
DatetimeIndex,
Index,
NaT,
Period,
Series,
Timedelta,
TimedeltaIndex,
Timestamp,
isna,
)
from pandas.core.arrays import PeriodArray
from pandas.util import testing as tm
@pytest.mark.parametrize(
"nat,idx",
[
(Timestamp("NaT"), DatetimeIndex),
(Timedelta("NaT"), TimedeltaIndex),
(Period("NaT", freq="M"), PeriodArray),
],
)
def test_nat_fields(nat, idx):
for field in idx._field_ops:
# weekday is a property of DTI, but a method
# on NaT/Timestamp for compat with datetime
if field == "weekday":
continue
result = getattr(NaT, field)
assert np.isnan(result)
result = getattr(nat, field)
assert np.isnan(result)
for field in idx._bool_ops:
result = getattr(NaT, field)
assert result is False
result = getattr(nat, field)
assert result is False
def test_nat_vector_field_access():
idx = DatetimeIndex(["1/1/2000", None, None, "1/4/2000"])
for field in DatetimeIndex._field_ops:
# weekday is a property of DTI, but a method
# on NaT/Timestamp for compat with datetime
if field == "weekday":
continue
result = getattr(idx, field)
expected = Index([getattr(x, field) for x in idx])
tm.assert_index_equal(result, expected)
ser = Series(idx)
for field in DatetimeIndex._field_ops:
# weekday is a property of DTI, but a method
# on NaT/Timestamp for compat with datetime
if field == "weekday":
continue
result = getattr(ser.dt, field)
expected = [getattr(x, field) for x in idx]
tm.assert_series_equal(result, Series(expected))
for field in DatetimeIndex._bool_ops:
result = getattr(ser.dt, field)
expected = [getattr(x, field) for x in idx]
tm.assert_series_equal(result, Series(expected))
@pytest.mark.parametrize("klass", [Timestamp, Timedelta, Period])
@pytest.mark.parametrize("value", [None, np.nan, iNaT, float("nan"), NaT, "NaT", "nat"])
def test_identity(klass, value):
assert klass(value) is NaT
@pytest.mark.parametrize("klass", [Timestamp, Timedelta, Period])
@pytest.mark.parametrize("value", ["", "nat", "NAT", None, np.nan])
def test_equality(klass, value):
if klass is Period and value == "":
pytest.skip("Period cannot parse empty string")
assert klass(value).value == iNaT
@pytest.mark.parametrize("klass", [Timestamp, Timedelta])
@pytest.mark.parametrize("method", ["round", "floor", "ceil"])
@pytest.mark.parametrize("freq", ["s", "5s", "min", "5min", "h", "5h"])
def test_round_nat(klass, method, freq):
# see gh-14940
ts = klass("nat")
round_method = getattr(ts, method)
assert round_method(freq) is ts
@pytest.mark.parametrize(
"method",
[
"astimezone",
"combine",
"ctime",
"dst",
"fromordinal",
"fromtimestamp",
"isocalendar",
"strftime",
"strptime",
"time",
"timestamp",
"timetuple",
"timetz",
"toordinal",
"tzname",
"utcfromtimestamp",
"utcnow",
"utcoffset",
"utctimetuple",
"timestamp",
],
)
def test_nat_methods_raise(method):
# see gh-9513, gh-17329
msg = "NaTType does not support {method}".format(method=method)
with pytest.raises(ValueError, match=msg):
getattr(NaT, method)()
@pytest.mark.parametrize("method", ["weekday", "isoweekday"])
def test_nat_methods_nan(method):
# see gh-9513, gh-17329
assert np.isnan(getattr(NaT, method)())
@pytest.mark.parametrize(
"method", ["date", "now", "replace", "today", "tz_convert", "tz_localize"]
)
def test_nat_methods_nat(method):
# see gh-8254, gh-9513, gh-17329
assert getattr(NaT, method)() is NaT
@pytest.mark.parametrize(
"get_nat", [lambda x: NaT, lambda x: Timedelta(x), lambda x: Timestamp(x)]
)
def test_nat_iso_format(get_nat):
# see gh-12300
assert get_nat("NaT").isoformat() == "NaT"
@pytest.mark.parametrize(
"klass,expected",
[
(Timestamp, ["freqstr", "normalize", "to_julian_date", "to_period", "tz"]),
(
Timedelta,
[
"components",
"delta",
"is_populated",
"resolution_string",
"to_pytimedelta",
"to_timedelta64",
"view",
],
),
],
)
def test_missing_public_nat_methods(klass, expected):
# see gh-17327
#
# NaT should have *most* of the Timestamp and Timedelta methods.
# Here, we check which public methods NaT does not have. We
# ignore any missing private methods.
nat_names = dir(NaT)
klass_names = dir(klass)
missing = [x for x in klass_names if x not in nat_names and not x.startswith("_")]
missing.sort()
assert missing == expected
def _get_overlap_public_nat_methods(klass, as_tuple=False):
"""
Get overlapping public methods between NaT and another class.
Parameters
----------
klass : type
The class to compare with NaT
as_tuple : bool, default False
Whether to return a list of tuples of the form (klass, method).
Returns
-------
overlap : list
"""
nat_names = dir(NaT)
klass_names = dir(klass)
overlap = [
x
for x in nat_names
if x in klass_names and not x.startswith("_") and callable(getattr(klass, x))
]
# Timestamp takes precedence over Timedelta in terms of overlap.
if klass is Timedelta:
ts_names = dir(Timestamp)
overlap = [x for x in overlap if x not in ts_names]
if as_tuple:
overlap = [(klass, method) for method in overlap]
overlap.sort()
return overlap
@pytest.mark.parametrize(
"klass,expected",
[
(
Timestamp,
[
"astimezone",
"ceil",
"combine",
"ctime",
"date",
"day_name",
"dst",
"floor",
"fromisoformat",
"fromordinal",
"fromtimestamp",
"isocalendar",
"isoformat",
"isoweekday",
"month_name",
"now",
"replace",
"round",
"strftime",
"strptime",
"time",
"timestamp",
"timetuple",
"timetz",
"to_datetime64",
"to_numpy",
"to_pydatetime",
"today",
"toordinal",
"tz_convert",
"tz_localize",
"tzname",
"utcfromtimestamp",
"utcnow",
"utcoffset",
"utctimetuple",
"weekday",
],
),
(Timedelta, ["total_seconds"]),
],
)
def test_overlap_public_nat_methods(klass, expected):
# see gh-17327
#
# NaT should have *most* of the Timestamp and Timedelta methods.
# In case when Timestamp, Timedelta, and NaT are overlap, the overlap
# is considered to be with Timestamp and NaT, not Timedelta.
# "fromisoformat" was introduced in 3.7
if klass is Timestamp and not compat.PY37:
expected.remove("fromisoformat")
assert _get_overlap_public_nat_methods(klass) == expected
@pytest.mark.parametrize(
"compare",
(
_get_overlap_public_nat_methods(Timestamp, True)
+ _get_overlap_public_nat_methods(Timedelta, True)
),
)
def test_nat_doc_strings(compare):
# see gh-17327
#
# The docstrings for overlapping methods should match.
klass, method = compare
klass_doc = getattr(klass, method).__doc__
nat_doc = getattr(NaT, method).__doc__
assert klass_doc == nat_doc
_ops = {
"left_plus_right": lambda a, b: a + b,
"right_plus_left": lambda a, b: b + a,
"left_minus_right": lambda a, b: a - b,
"right_minus_left": lambda a, b: b - a,
"left_times_right": lambda a, b: a * b,
"right_times_left": lambda a, b: b * a,
"left_div_right": lambda a, b: a / b,
"right_div_left": lambda a, b: b / a,
}
@pytest.mark.parametrize("op_name", list(_ops.keys()))
@pytest.mark.parametrize(
"value,val_type",
[
(2, "scalar"),
(1.5, "scalar"),
(np.nan, "scalar"),
(timedelta(3600), "timedelta"),
(Timedelta("5s"), "timedelta"),
(datetime(2014, 1, 1), "timestamp"),
(Timestamp("2014-01-01"), "timestamp"),
(Timestamp("2014-01-01", tz="UTC"), "timestamp"),
(Timestamp("2014-01-01", tz="US/Eastern"), "timestamp"),
(pytz.timezone("Asia/Tokyo").localize(datetime(2014, 1, 1)), "timestamp"),
],
)
def test_nat_arithmetic_scalar(op_name, value, val_type):
# see gh-6873
invalid_ops = {
"scalar": {"right_div_left"},
"timedelta": {"left_times_right", "right_times_left"},
"timestamp": {
"left_times_right",
"right_times_left",
"left_div_right",
"right_div_left",
},
}
op = _ops[op_name]
if op_name in invalid_ops.get(val_type, set()):
if (
val_type == "timedelta"
and "times" in op_name
and isinstance(value, Timedelta)
):
msg = "Cannot multiply"
else:
msg = "unsupported operand type"
with pytest.raises(TypeError, match=msg):
op(NaT, value)
else:
if val_type == "timedelta" and "div" in op_name:
expected = np.nan
else:
expected = NaT
assert op(NaT, value) is expected
@pytest.mark.parametrize(
"val,expected", [(np.nan, NaT), (NaT, np.nan), (np.timedelta64("NaT"), np.nan)]
)
def test_nat_rfloordiv_timedelta(val, expected):
# see gh-#18846
#
# See also test_timedelta.TestTimedeltaArithmetic.test_floordiv
td = Timedelta(hours=3, minutes=4)
assert td // val is expected
@pytest.mark.parametrize(
"op_name",
["left_plus_right", "right_plus_left", "left_minus_right", "right_minus_left"],
)
@pytest.mark.parametrize(
"value",
[
DatetimeIndex(["2011-01-01", "2011-01-02"], name="x"),
DatetimeIndex(["2011-01-01", "2011-01-02"], name="x"),
TimedeltaIndex(["1 day", "2 day"], name="x"),
],
)
def test_nat_arithmetic_index(op_name, value):
# see gh-11718
exp_name = "x"
exp_data = [NaT] * 2
if isinstance(value, DatetimeIndex) and "plus" in op_name:
expected = DatetimeIndex(exp_data, name=exp_name, tz=value.tz)
else:
expected = TimedeltaIndex(exp_data, name=exp_name)
tm.assert_index_equal(_ops[op_name](NaT, value), expected)
@pytest.mark.parametrize(
"op_name",
["left_plus_right", "right_plus_left", "left_minus_right", "right_minus_left"],
)
@pytest.mark.parametrize("box", [TimedeltaIndex, Series])
def test_nat_arithmetic_td64_vector(op_name, box):
# see gh-19124
vec = box(["1 day", "2 day"], dtype="timedelta64[ns]")
box_nat = box([NaT, NaT], dtype="timedelta64[ns]")
tm.assert_equal(_ops[op_name](vec, NaT), box_nat)
def test_nat_pinned_docstrings():
# see gh-17327
assert NaT.ctime.__doc__ == datetime.ctime.__doc__
def test_to_numpy_alias():
# GH 24653: alias .to_numpy() for scalars
expected = NaT.to_datetime64()
result = NaT.to_numpy()
assert isna(expected) and isna(result)
@pytest.mark.parametrize("other", [Timedelta(0), Timestamp(0)])
def test_nat_comparisons(compare_operators_no_eq_ne, other):
# GH 26039
assert getattr(NaT, compare_operators_no_eq_ne)(other) is False
assert getattr(other, compare_operators_no_eq_ne)(NaT) is False