import pytest
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from pandas.errors import NullFrequencyError
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import pandas as pd
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from pandas import TimedeltaIndex
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import pandas._testing as tm
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class TestTimedeltaIndexShift:
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# -------------------------------------------------------------
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# TimedeltaIndex.shift is used by __add__/__sub__
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def test_tdi_shift_empty(self):
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# GH#9903
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idx = TimedeltaIndex([], name="xxx")
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tm.assert_index_equal(idx.shift(0, freq="H"), idx)
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tm.assert_index_equal(idx.shift(3, freq="H"), idx)
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def test_tdi_shift_hours(self):
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# GH#9903
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idx = TimedeltaIndex(["5 hours", "6 hours", "9 hours"], name="xxx")
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tm.assert_index_equal(idx.shift(0, freq="H"), idx)
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exp = TimedeltaIndex(["8 hours", "9 hours", "12 hours"], name="xxx")
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tm.assert_index_equal(idx.shift(3, freq="H"), exp)
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exp = TimedeltaIndex(["2 hours", "3 hours", "6 hours"], name="xxx")
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tm.assert_index_equal(idx.shift(-3, freq="H"), exp)
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def test_tdi_shift_minutes(self):
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# GH#9903
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idx = TimedeltaIndex(["5 hours", "6 hours", "9 hours"], name="xxx")
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tm.assert_index_equal(idx.shift(0, freq="T"), idx)
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exp = TimedeltaIndex(["05:03:00", "06:03:00", "9:03:00"], name="xxx")
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tm.assert_index_equal(idx.shift(3, freq="T"), exp)
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exp = TimedeltaIndex(["04:57:00", "05:57:00", "8:57:00"], name="xxx")
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tm.assert_index_equal(idx.shift(-3, freq="T"), exp)
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def test_tdi_shift_int(self):
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# GH#8083
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tdi = pd.to_timedelta(range(5), unit="d")
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trange = tdi._with_freq("infer") + pd.offsets.Hour(1)
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result = trange.shift(1)
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expected = TimedeltaIndex(
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[
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"1 days 01:00:00",
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"2 days 01:00:00",
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"3 days 01:00:00",
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"4 days 01:00:00",
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"5 days 01:00:00",
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],
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freq="D",
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)
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tm.assert_index_equal(result, expected)
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def test_tdi_shift_nonstandard_freq(self):
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# GH#8083
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tdi = pd.to_timedelta(range(5), unit="d")
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trange = tdi._with_freq("infer") + pd.offsets.Hour(1)
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result = trange.shift(3, freq="2D 1s")
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expected = TimedeltaIndex(
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[
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"6 days 01:00:03",
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"7 days 01:00:03",
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"8 days 01:00:03",
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"9 days 01:00:03",
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"10 days 01:00:03",
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],
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freq="D",
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)
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tm.assert_index_equal(result, expected)
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def test_shift_no_freq(self):
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# GH#19147
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tdi = TimedeltaIndex(["1 days 01:00:00", "2 days 01:00:00"], freq=None)
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with pytest.raises(NullFrequencyError, match="Cannot shift with no freq"):
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tdi.shift(2)
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