import numpy as np
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import pytest
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from pandas import (
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PeriodIndex,
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period_range,
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)
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import pandas._testing as tm
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class TestPeriodIndexShift:
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# ---------------------------------------------------------------
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# PeriodIndex.shift is used by __add__ and __sub__
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def test_pi_shift_ndarray(self):
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idx = PeriodIndex(
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["2011-01", "2011-02", "NaT", "2011-04"], freq="M", name="idx"
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)
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result = idx.shift(np.array([1, 2, 3, 4]))
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expected = PeriodIndex(
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["2011-02", "2011-04", "NaT", "2011-08"], freq="M", name="idx"
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)
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tm.assert_index_equal(result, expected)
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result = idx.shift(np.array([1, -2, 3, -4]))
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expected = PeriodIndex(
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["2011-02", "2010-12", "NaT", "2010-12"], freq="M", name="idx"
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)
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tm.assert_index_equal(result, expected)
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def test_shift(self):
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pi1 = period_range(freq="A", start="1/1/2001", end="12/1/2009")
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pi2 = period_range(freq="A", start="1/1/2002", end="12/1/2010")
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tm.assert_index_equal(pi1.shift(0), pi1)
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assert len(pi1) == len(pi2)
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tm.assert_index_equal(pi1.shift(1), pi2)
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pi1 = period_range(freq="A", start="1/1/2001", end="12/1/2009")
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pi2 = period_range(freq="A", start="1/1/2000", end="12/1/2008")
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assert len(pi1) == len(pi2)
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tm.assert_index_equal(pi1.shift(-1), pi2)
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pi1 = period_range(freq="M", start="1/1/2001", end="12/1/2009")
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pi2 = period_range(freq="M", start="2/1/2001", end="1/1/2010")
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assert len(pi1) == len(pi2)
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tm.assert_index_equal(pi1.shift(1), pi2)
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pi1 = period_range(freq="M", start="1/1/2001", end="12/1/2009")
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pi2 = period_range(freq="M", start="12/1/2000", end="11/1/2009")
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assert len(pi1) == len(pi2)
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tm.assert_index_equal(pi1.shift(-1), pi2)
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pi1 = period_range(freq="D", start="1/1/2001", end="12/1/2009")
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pi2 = period_range(freq="D", start="1/2/2001", end="12/2/2009")
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assert len(pi1) == len(pi2)
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tm.assert_index_equal(pi1.shift(1), pi2)
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pi1 = period_range(freq="D", start="1/1/2001", end="12/1/2009")
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pi2 = period_range(freq="D", start="12/31/2000", end="11/30/2009")
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assert len(pi1) == len(pi2)
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tm.assert_index_equal(pi1.shift(-1), pi2)
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def test_shift_corner_cases(self):
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# GH#9903
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idx = PeriodIndex([], name="xxx", freq="H")
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msg = "`freq` argument is not supported for PeriodIndex.shift"
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with pytest.raises(TypeError, match=msg):
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# period shift doesn't accept freq
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idx.shift(1, freq="H")
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tm.assert_index_equal(idx.shift(0), idx)
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tm.assert_index_equal(idx.shift(3), idx)
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idx = PeriodIndex(
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["2011-01-01 10:00", "2011-01-01 11:00", "2011-01-01 12:00"],
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name="xxx",
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freq="H",
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)
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tm.assert_index_equal(idx.shift(0), idx)
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exp = PeriodIndex(
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["2011-01-01 13:00", "2011-01-01 14:00", "2011-01-01 15:00"],
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name="xxx",
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freq="H",
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)
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tm.assert_index_equal(idx.shift(3), exp)
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exp = PeriodIndex(
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["2011-01-01 07:00", "2011-01-01 08:00", "2011-01-01 09:00"],
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name="xxx",
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freq="H",
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)
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tm.assert_index_equal(idx.shift(-3), exp)
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def test_shift_nat(self):
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idx = PeriodIndex(
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["2011-01", "2011-02", "NaT", "2011-04"], freq="M", name="idx"
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)
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result = idx.shift(1)
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expected = PeriodIndex(
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["2011-02", "2011-03", "NaT", "2011-05"], freq="M", name="idx"
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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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def test_shift_gh8083(self):
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# test shift for PeriodIndex
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# GH#8083
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drange = period_range("20130101", periods=5, freq="D")
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result = drange.shift(1)
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expected = PeriodIndex(
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["2013-01-02", "2013-01-03", "2013-01-04", "2013-01-05", "2013-01-06"],
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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_periods(self):
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# GH #22458 : argument 'n' was deprecated in favor of 'periods'
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idx = period_range(freq="A", start="1/1/2001", end="12/1/2009")
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tm.assert_index_equal(idx.shift(periods=0), idx)
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tm.assert_index_equal(idx.shift(0), idx)
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