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 TestPeriodIndex:
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def test_asfreq(self):
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pi1 = period_range(freq="A", start="1/1/2001", end="1/1/2001")
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pi2 = period_range(freq="Q", start="1/1/2001", end="1/1/2001")
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pi3 = period_range(freq="M", start="1/1/2001", end="1/1/2001")
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pi4 = period_range(freq="D", start="1/1/2001", end="1/1/2001")
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pi5 = period_range(freq="H", start="1/1/2001", end="1/1/2001 00:00")
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pi6 = period_range(freq="Min", start="1/1/2001", end="1/1/2001 00:00")
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pi7 = period_range(freq="S", start="1/1/2001", end="1/1/2001 00:00:00")
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assert pi1.asfreq("Q", "S") == pi2
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assert pi1.asfreq("Q", "s") == pi2
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assert pi1.asfreq("M", "start") == pi3
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assert pi1.asfreq("D", "StarT") == pi4
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assert pi1.asfreq("H", "beGIN") == pi5
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assert pi1.asfreq("Min", "S") == pi6
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assert pi1.asfreq("S", "S") == pi7
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assert pi2.asfreq("A", "S") == pi1
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assert pi2.asfreq("M", "S") == pi3
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assert pi2.asfreq("D", "S") == pi4
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assert pi2.asfreq("H", "S") == pi5
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assert pi2.asfreq("Min", "S") == pi6
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assert pi2.asfreq("S", "S") == pi7
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assert pi3.asfreq("A", "S") == pi1
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assert pi3.asfreq("Q", "S") == pi2
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assert pi3.asfreq("D", "S") == pi4
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assert pi3.asfreq("H", "S") == pi5
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assert pi3.asfreq("Min", "S") == pi6
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assert pi3.asfreq("S", "S") == pi7
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assert pi4.asfreq("A", "S") == pi1
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assert pi4.asfreq("Q", "S") == pi2
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assert pi4.asfreq("M", "S") == pi3
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assert pi4.asfreq("H", "S") == pi5
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assert pi4.asfreq("Min", "S") == pi6
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assert pi4.asfreq("S", "S") == pi7
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assert pi5.asfreq("A", "S") == pi1
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assert pi5.asfreq("Q", "S") == pi2
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assert pi5.asfreq("M", "S") == pi3
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assert pi5.asfreq("D", "S") == pi4
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assert pi5.asfreq("Min", "S") == pi6
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assert pi5.asfreq("S", "S") == pi7
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assert pi6.asfreq("A", "S") == pi1
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assert pi6.asfreq("Q", "S") == pi2
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assert pi6.asfreq("M", "S") == pi3
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assert pi6.asfreq("D", "S") == pi4
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assert pi6.asfreq("H", "S") == pi5
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assert pi6.asfreq("S", "S") == pi7
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assert pi7.asfreq("A", "S") == pi1
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assert pi7.asfreq("Q", "S") == pi2
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assert pi7.asfreq("M", "S") == pi3
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assert pi7.asfreq("D", "S") == pi4
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assert pi7.asfreq("H", "S") == pi5
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assert pi7.asfreq("Min", "S") == pi6
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msg = "How must be one of S or E"
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with pytest.raises(ValueError, match=msg):
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pi7.asfreq("T", "foo")
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result1 = pi1.asfreq("3M")
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result2 = pi1.asfreq("M")
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expected = period_range(freq="M", start="2001-12", end="2001-12")
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tm.assert_numpy_array_equal(result1.asi8, expected.asi8)
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assert result1.freqstr == "3M"
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tm.assert_numpy_array_equal(result2.asi8, expected.asi8)
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assert result2.freqstr == "M"
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def test_asfreq_nat(self):
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idx = PeriodIndex(["2011-01", "2011-02", "NaT", "2011-04"], freq="M")
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result = idx.asfreq(freq="Q")
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expected = PeriodIndex(["2011Q1", "2011Q1", "NaT", "2011Q2"], freq="Q")
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tm.assert_index_equal(result, expected)
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@pytest.mark.parametrize("freq", ["D", "3D"])
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def test_asfreq_mult_pi(self, freq):
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pi = PeriodIndex(["2001-01", "2001-02", "NaT", "2001-03"], freq="2M")
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result = pi.asfreq(freq)
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exp = PeriodIndex(["2001-02-28", "2001-03-31", "NaT", "2001-04-30"], freq=freq)
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tm.assert_index_equal(result, exp)
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assert result.freq == exp.freq
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result = pi.asfreq(freq, how="S")
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exp = PeriodIndex(["2001-01-01", "2001-02-01", "NaT", "2001-03-01"], freq=freq)
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tm.assert_index_equal(result, exp)
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assert result.freq == exp.freq
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def test_asfreq_combined_pi(self):
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pi = PeriodIndex(["2001-01-01 00:00", "2001-01-02 02:00", "NaT"], freq="H")
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exp = PeriodIndex(["2001-01-01 00:00", "2001-01-02 02:00", "NaT"], freq="25H")
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for freq, how in zip(["1D1H", "1H1D"], ["S", "E"]):
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result = pi.asfreq(freq, how=how)
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tm.assert_index_equal(result, exp)
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assert result.freq == exp.freq
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for freq in ["1D1H", "1H1D"]:
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pi = PeriodIndex(["2001-01-01 00:00", "2001-01-02 02:00", "NaT"], freq=freq)
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result = pi.asfreq("H")
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exp = PeriodIndex(["2001-01-02 00:00", "2001-01-03 02:00", "NaT"], freq="H")
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tm.assert_index_equal(result, exp)
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assert result.freq == exp.freq
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pi = PeriodIndex(["2001-01-01 00:00", "2001-01-02 02:00", "NaT"], freq=freq)
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result = pi.asfreq("H", how="S")
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exp = PeriodIndex(["2001-01-01 00:00", "2001-01-02 02:00", "NaT"], freq="H")
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tm.assert_index_equal(result, exp)
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assert result.freq == exp.freq
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def test_astype_asfreq(self):
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pi1 = PeriodIndex(["2011-01-01", "2011-02-01", "2011-03-01"], freq="D")
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exp = PeriodIndex(["2011-01", "2011-02", "2011-03"], freq="M")
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tm.assert_index_equal(pi1.asfreq("M"), exp)
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tm.assert_index_equal(pi1.astype("period[M]"), exp)
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exp = PeriodIndex(["2011-01", "2011-02", "2011-03"], freq="3M")
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tm.assert_index_equal(pi1.asfreq("3M"), exp)
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tm.assert_index_equal(pi1.astype("period[3M]"), exp)
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