from datetime import datetime
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import numpy as np
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import pytest
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import pytz
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from pandas import (
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NA,
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DatetimeIndex,
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Index,
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NaT,
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Timestamp,
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date_range,
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)
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import pandas._testing as tm
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class TestInsert:
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@pytest.mark.parametrize("null", [None, np.nan, np.datetime64("NaT"), NaT, NA])
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@pytest.mark.parametrize("tz", [None, "UTC", "US/Eastern"])
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def test_insert_nat(self, tz, null):
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# GH#16537, GH#18295 (test missing)
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idx = DatetimeIndex(["2017-01-01"], tz=tz)
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expected = DatetimeIndex(["NaT", "2017-01-01"], tz=tz)
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if tz is not None and isinstance(null, np.datetime64):
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expected = Index([null, idx[0]], dtype=object)
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res = idx.insert(0, null)
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tm.assert_index_equal(res, expected)
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@pytest.mark.parametrize("tz", [None, "UTC", "US/Eastern"])
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def test_insert_invalid_na(self, tz):
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idx = DatetimeIndex(["2017-01-01"], tz=tz)
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item = np.timedelta64("NaT")
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result = idx.insert(0, item)
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expected = Index([item] + list(idx), dtype=object)
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tm.assert_index_equal(result, expected)
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def test_insert_empty_preserves_freq(self, tz_naive_fixture):
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# GH#33573
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tz = tz_naive_fixture
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dti = DatetimeIndex([], tz=tz, freq="D")
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item = Timestamp("2017-04-05").tz_localize(tz)
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result = dti.insert(0, item)
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assert result.freq == dti.freq
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# But not when we insert an item that doesn't conform to freq
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dti = DatetimeIndex([], tz=tz, freq="W-THU")
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result = dti.insert(0, item)
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assert result.freq is None
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def test_insert(self):
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idx = DatetimeIndex(["2000-01-04", "2000-01-01", "2000-01-02"], name="idx")
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result = idx.insert(2, datetime(2000, 1, 5))
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exp = DatetimeIndex(
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["2000-01-04", "2000-01-01", "2000-01-05", "2000-01-02"], name="idx"
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)
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tm.assert_index_equal(result, exp)
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# insertion of non-datetime should coerce to object index
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result = idx.insert(1, "inserted")
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expected = Index(
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[
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datetime(2000, 1, 4),
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"inserted",
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datetime(2000, 1, 1),
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datetime(2000, 1, 2),
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],
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name="idx",
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)
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assert not isinstance(result, DatetimeIndex)
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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idx = date_range("1/1/2000", periods=3, freq="M", name="idx")
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# preserve freq
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expected_0 = DatetimeIndex(
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["1999-12-31", "2000-01-31", "2000-02-29", "2000-03-31"],
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name="idx",
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freq="M",
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)
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expected_3 = DatetimeIndex(
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["2000-01-31", "2000-02-29", "2000-03-31", "2000-04-30"],
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name="idx",
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freq="M",
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)
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# reset freq to None
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expected_1_nofreq = DatetimeIndex(
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["2000-01-31", "2000-01-31", "2000-02-29", "2000-03-31"],
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name="idx",
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freq=None,
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)
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expected_3_nofreq = DatetimeIndex(
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["2000-01-31", "2000-02-29", "2000-03-31", "2000-01-02"],
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name="idx",
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freq=None,
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)
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cases = [
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(0, datetime(1999, 12, 31), expected_0),
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(-3, datetime(1999, 12, 31), expected_0),
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(3, datetime(2000, 4, 30), expected_3),
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(1, datetime(2000, 1, 31), expected_1_nofreq),
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(3, datetime(2000, 1, 2), expected_3_nofreq),
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]
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for n, d, expected in cases:
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result = idx.insert(n, d)
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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assert result.freq == expected.freq
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# reset freq to None
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result = idx.insert(3, datetime(2000, 1, 2))
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expected = DatetimeIndex(
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["2000-01-31", "2000-02-29", "2000-03-31", "2000-01-02"],
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name="idx",
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freq=None,
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)
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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assert result.freq is None
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for tz in ["US/Pacific", "Asia/Singapore"]:
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idx = date_range("1/1/2000 09:00", periods=6, freq="H", tz=tz, name="idx")
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# preserve freq
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expected = date_range(
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"1/1/2000 09:00", periods=7, freq="H", tz=tz, name="idx"
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)
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for d in [
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Timestamp("2000-01-01 15:00", tz=tz),
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pytz.timezone(tz).localize(datetime(2000, 1, 1, 15)),
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]:
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result = idx.insert(6, d)
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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assert result.freq == expected.freq
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assert result.tz == expected.tz
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expected = DatetimeIndex(
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[
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"2000-01-01 09:00",
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"2000-01-01 10:00",
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"2000-01-01 11:00",
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"2000-01-01 12:00",
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"2000-01-01 13:00",
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"2000-01-01 14:00",
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"2000-01-01 10:00",
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],
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name="idx",
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tz=tz,
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freq=None,
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)
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# reset freq to None
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for d in [
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Timestamp("2000-01-01 10:00", tz=tz),
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pytz.timezone(tz).localize(datetime(2000, 1, 1, 10)),
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]:
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result = idx.insert(6, d)
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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assert result.tz == expected.tz
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assert result.freq is None
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# TODO: also changes DataFrame.__setitem__ with expansion
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def test_insert_mismatched_tzawareness(self):
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# see GH#7299
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idx = date_range("1/1/2000", periods=3, freq="D", tz="Asia/Tokyo", name="idx")
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# mismatched tz-awareness
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item = Timestamp("2000-01-04")
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result = idx.insert(3, item)
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expected = Index(
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list(idx[:3]) + [item] + list(idx[3:]), dtype=object, name="idx"
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)
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tm.assert_index_equal(result, expected)
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# mismatched tz-awareness
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item = datetime(2000, 1, 4)
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result = idx.insert(3, item)
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expected = Index(
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list(idx[:3]) + [item] + list(idx[3:]), dtype=object, name="idx"
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)
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tm.assert_index_equal(result, expected)
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# TODO: also changes DataFrame.__setitem__ with expansion
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def test_insert_mismatched_tz(self):
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# see GH#7299
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# pre-2.0 with mismatched tzs we would cast to object
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idx = date_range("1/1/2000", periods=3, freq="D", tz="Asia/Tokyo", name="idx")
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# mismatched tz -> cast to object (could reasonably cast to same tz or UTC)
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item = Timestamp("2000-01-04", tz="US/Eastern")
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result = idx.insert(3, item)
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expected = Index(
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list(idx[:3]) + [item.tz_convert(idx.tz)] + list(idx[3:]),
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name="idx",
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)
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assert expected.dtype == idx.dtype
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tm.assert_index_equal(result, expected)
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item = datetime(2000, 1, 4, tzinfo=pytz.timezone("US/Eastern"))
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result = idx.insert(3, item)
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expected = Index(
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list(idx[:3]) + [item.astimezone(idx.tzinfo)] + list(idx[3:]),
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name="idx",
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)
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assert expected.dtype == idx.dtype
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tm.assert_index_equal(result, expected)
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@pytest.mark.parametrize(
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"item", [0, np.int64(0), np.float64(0), np.array(0), np.timedelta64(456)]
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)
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def test_insert_mismatched_types_raises(self, tz_aware_fixture, item):
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# GH#33703 dont cast these to dt64
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tz = tz_aware_fixture
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dti = date_range("2019-11-04", periods=9, freq="-1D", name=9, tz=tz)
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result = dti.insert(1, item)
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if isinstance(item, np.ndarray):
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assert item.item() == 0
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expected = Index([dti[0], 0] + list(dti[1:]), dtype=object, name=9)
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else:
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expected = Index([dti[0], item] + list(dti[1:]), dtype=object, name=9)
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tm.assert_index_equal(result, expected)
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def test_insert_castable_str(self, tz_aware_fixture):
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# GH#33703
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tz = tz_aware_fixture
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dti = date_range("2019-11-04", periods=3, freq="-1D", name=9, tz=tz)
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value = "2019-11-05"
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result = dti.insert(0, value)
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ts = Timestamp(value).tz_localize(tz)
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expected = DatetimeIndex([ts] + list(dti), dtype=dti.dtype, name=9)
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tm.assert_index_equal(result, expected)
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def test_insert_non_castable_str(self, tz_aware_fixture):
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# GH#33703
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tz = tz_aware_fixture
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dti = date_range("2019-11-04", periods=3, freq="-1D", name=9, tz=tz)
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value = "foo"
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result = dti.insert(0, value)
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expected = Index(["foo"] + list(dti), dtype=object, name=9)
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tm.assert_index_equal(result, expected)
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