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test_insert.py
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from datetime import datetime
import numpy as np
import pytest
import pytz
from pandas import NA, DatetimeIndex, Index, NaT, Timestamp, date_range
import pandas._testing as tm
class TestInsert:
@pytest.mark.parametrize("null", [None, np.nan, np.datetime64("NaT"), NaT, NA])
@pytest.mark.parametrize("tz", [None, "UTC", "US/Eastern"])
def test_insert_nat(self, tz, null):
# GH#16537, GH#18295 (test missing)
idx = DatetimeIndex(["2017-01-01"], tz=tz)
expected = DatetimeIndex(["NaT", "2017-01-01"], tz=tz)
res = idx.insert(0, null)
tm.assert_index_equal(res, expected)
@pytest.mark.parametrize("tz", [None, "UTC", "US/Eastern"])
def test_insert_invalid_na(self, tz):
idx = DatetimeIndex(["2017-01-01"], tz=tz)
item = np.timedelta64("NaT")
result = idx.insert(0, item)
expected = Index([item] + list(idx), dtype=object)
tm.assert_index_equal(result, expected)
def test_insert_empty_preserves_freq(self, tz_naive_fixture):
# GH#33573
tz = tz_naive_fixture
dti = DatetimeIndex([], tz=tz, freq="D")
item = Timestamp("2017-04-05").tz_localize(tz)
result = dti.insert(0, item)
assert result.freq == dti.freq
# But not when we insert an item that doesnt conform to freq
dti = DatetimeIndex([], tz=tz, freq="W-THU")
result = dti.insert(0, item)
assert result.freq is None
def test_insert(self):
idx = DatetimeIndex(["2000-01-04", "2000-01-01", "2000-01-02"], name="idx")
result = idx.insert(2, datetime(2000, 1, 5))
exp = DatetimeIndex(
["2000-01-04", "2000-01-01", "2000-01-05", "2000-01-02"], name="idx"
)
tm.assert_index_equal(result, exp)
# insertion of non-datetime should coerce to object index
result = idx.insert(1, "inserted")
expected = Index(
[
datetime(2000, 1, 4),
"inserted",
datetime(2000, 1, 1),
datetime(2000, 1, 2),
],
name="idx",
)
assert not isinstance(result, DatetimeIndex)
tm.assert_index_equal(result, expected)
assert result.name == expected.name
idx = date_range("1/1/2000", periods=3, freq="M", name="idx")
# preserve freq
expected_0 = DatetimeIndex(
["1999-12-31", "2000-01-31", "2000-02-29", "2000-03-31"],
name="idx",
freq="M",
)
expected_3 = DatetimeIndex(
["2000-01-31", "2000-02-29", "2000-03-31", "2000-04-30"],
name="idx",
freq="M",
)
# reset freq to None
expected_1_nofreq = DatetimeIndex(
["2000-01-31", "2000-01-31", "2000-02-29", "2000-03-31"],
name="idx",
freq=None,
)
expected_3_nofreq = DatetimeIndex(
["2000-01-31", "2000-02-29", "2000-03-31", "2000-01-02"],
name="idx",
freq=None,
)
cases = [
(0, datetime(1999, 12, 31), expected_0),
(-3, datetime(1999, 12, 31), expected_0),
(3, datetime(2000, 4, 30), expected_3),
(1, datetime(2000, 1, 31), expected_1_nofreq),
(3, datetime(2000, 1, 2), expected_3_nofreq),
]
for n, d, expected in cases:
result = idx.insert(n, d)
tm.assert_index_equal(result, expected)
assert result.name == expected.name
assert result.freq == expected.freq
# reset freq to None
result = idx.insert(3, datetime(2000, 1, 2))
expected = DatetimeIndex(
["2000-01-31", "2000-02-29", "2000-03-31", "2000-01-02"],
name="idx",
freq=None,
)
tm.assert_index_equal(result, expected)
assert result.name == expected.name
assert result.freq is None
for tz in ["US/Pacific", "Asia/Singapore"]:
idx = date_range("1/1/2000 09:00", periods=6, freq="H", tz=tz, name="idx")
# preserve freq
expected = date_range(
"1/1/2000 09:00", periods=7, freq="H", tz=tz, name="idx"
)
for d in [
Timestamp("2000-01-01 15:00", tz=tz),
pytz.timezone(tz).localize(datetime(2000, 1, 1, 15)),
]:
result = idx.insert(6, d)
tm.assert_index_equal(result, expected)
assert result.name == expected.name
assert result.freq == expected.freq
assert result.tz == expected.tz
expected = DatetimeIndex(
[
"2000-01-01 09:00",
"2000-01-01 10:00",
"2000-01-01 11:00",
"2000-01-01 12:00",
"2000-01-01 13:00",
"2000-01-01 14:00",
"2000-01-01 10:00",
],
name="idx",
tz=tz,
freq=None,
)
# reset freq to None
for d in [
Timestamp("2000-01-01 10:00", tz=tz),
pytz.timezone(tz).localize(datetime(2000, 1, 1, 10)),
]:
result = idx.insert(6, d)
tm.assert_index_equal(result, expected)
assert result.name == expected.name
assert result.tz == expected.tz
assert result.freq is None
# TODO: also changes DataFrame.__setitem__ with expansion
def test_insert_mismatched_tzawareness(self):
# see GH#7299
idx = date_range("1/1/2000", periods=3, freq="D", tz="Asia/Tokyo", name="idx")
# mismatched tz-awareness
item = Timestamp("2000-01-04")
result = idx.insert(3, item)
expected = Index(
list(idx[:3]) + [item] + list(idx[3:]), dtype=object, name="idx"
)
tm.assert_index_equal(result, expected)
# mismatched tz-awareness
item = datetime(2000, 1, 4)
result = idx.insert(3, item)
expected = Index(
list(idx[:3]) + [item] + list(idx[3:]), dtype=object, name="idx"
)
tm.assert_index_equal(result, expected)
# TODO: also changes DataFrame.__setitem__ with expansion
def test_insert_mismatched_tz(self):
# see GH#7299
idx = date_range("1/1/2000", periods=3, freq="D", tz="Asia/Tokyo", name="idx")
# mismatched tz -> cast to object (could reasonably cast to same tz or UTC)
item = Timestamp("2000-01-04", tz="US/Eastern")
result = idx.insert(3, item)
expected = Index(
list(idx[:3]) + [item] + list(idx[3:]), dtype=object, name="idx"
)
tm.assert_index_equal(result, expected)
# mismatched tz -> cast to object (could reasonably cast to same tz)
item = datetime(2000, 1, 4, tzinfo=pytz.timezone("US/Eastern"))
result = idx.insert(3, item)
expected = Index(
list(idx[:3]) + [item] + list(idx[3:]), dtype=object, name="idx"
)
tm.assert_index_equal(result, expected)
@pytest.mark.parametrize(
"item", [0, np.int64(0), np.float64(0), np.array(0), np.timedelta64(456)]
)
def test_insert_mismatched_types_raises(self, tz_aware_fixture, item):
# GH#33703 dont cast these to dt64
tz = tz_aware_fixture
dti = date_range("2019-11-04", periods=9, freq="-1D", name=9, tz=tz)
result = dti.insert(1, item)
if isinstance(item, np.ndarray):
# FIXME: without doing .item() here this segfaults
assert item.item() == 0
expected = Index([dti[0], 0] + list(dti[1:]), dtype=object, name=9)
else:
expected = Index([dti[0], item] + list(dti[1:]), dtype=object, name=9)
tm.assert_index_equal(result, expected)
def test_insert_castable_str(self, tz_aware_fixture):
# GH#33703
tz = tz_aware_fixture
dti = date_range("2019-11-04", periods=3, freq="-1D", name=9, tz=tz)
value = "2019-11-05"
result = dti.insert(0, value)
ts = Timestamp(value).tz_localize(tz)
expected = DatetimeIndex([ts] + list(dti), dtype=dti.dtype, name=9)
tm.assert_index_equal(result, expected)
def test_insert_non_castable_str(self, tz_aware_fixture):
# GH#33703
tz = tz_aware_fixture
dti = date_range("2019-11-04", periods=3, freq="-1D", name=9, tz=tz)
value = "foo"
result = dti.insert(0, value)
expected = Index(["foo"] + list(dti), dtype=object, name=9)
tm.assert_index_equal(result, expected)